Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1574f4ee920313…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 17:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7abed7cdb22f88f4bad09985aec40b3e SHA-1: 46aa795e886f16d63091163e81380be8f90fce43 SHA-256: 6f1574f4ee920313ac5ca08ead48e7233c2b3bb085ec28d1bf7907cdafc64b38
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites, suggesting it is used to host malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into downloading a malicious file, likely a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fe92a707b33a098fe7cda8630cba70b2/60844351076.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608277a1ec4b9---69473540222.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3997qod1dtmaidvik3lmg07qjl/20114855912.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501030558558968664.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638126560a---81704098810.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084b35f132---vuzede.pdfIn PDF document text
    • http://vhktn.at/images/content/files/22460569685.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/62cd049fda31dd3ee074fc188e1cdfdb/lufatixobusa.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/74e720a42c3dd867bebf4b5407c92ffa/toxosedawawomu.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/81817568664.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b588287eb03---zojofazabonixasagegak.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/xajinimumoxove.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wefufijirida.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p4vceej5f1vp351gqt4okkb3n/73562104996.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/26937693418.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/18842280215.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624381302.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c03b7c8c---resibuzajogajewozazotef.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2651eabda0---72924674270.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/kaseweliz.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/sogagurudifipawefej.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d68129604---xinawurisobitunupok.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c45b8d1---26637023663.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835242ef405---sasipazoreliber.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/41109117896.pdfPDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c529b8334303fc418f1017a83dc6c18f/lexivixeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=voice+changer+for+chromebook+osPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10840 bytes
SHA-256: 01ce91519c33321de8967614137a21db10aec3edf81b6730d7d8b0fc56aee525
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 17780 bytes
SHA-256: 30148d0e26cb1e2f622c888bf9ce985b9dd41bc7f79f68eb9496a8d44b249433

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