Malicious PDF — malware analysis report

Static analysis result for SHA-256 836482b8441cd9c8…

MALICIOUS

PDF

84.0 KB Created: 2021-07-17 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46ad4e1d6b3edaf3a1523b044116e81c SHA-1: 319fbe86739e2d467f46f455fef0bc26dc82ecf8 SHA-256: 836482b8441cd9c8e228fdfd002aef116e65efc4f23ca2cf35dc4bc448a55821
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://hyperasp.net/userfiles/file/33108522316.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ugu0j2eqqp2j454hq5bi7p1k86/pofaku.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/saduvurixodejunaragape.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21869215920.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/suzuzatafeluvewesokagukut.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/43419897316.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/bikekutegotepok.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/57063980540.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef306bc1063370419d690a2d74b46569/95648131658.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086649ab5286---jabapajejasujijo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/2499941168.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/97486326640.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8984c63a1237cd84c9198d87e83fee29/16482132039.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/1347143900.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/razegogawasobesoxuzefijo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c9cd0d94---93448123152.pdfIn PDF document text
    • http://jngf.cn/files/file/rizasejarokexolokela.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/74330475871.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c990ba40c01---towalusivikibabizajodes.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3840be58---63695030710.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/rinixonusajesamod.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/87378640167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=american+history+quiz+questions+and+answersPDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 11076 bytes
SHA-256: 841068cfbaf89bffe5b258e3593e83b66df9c447b0cb2330752897619f0c09d1
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 17352 bytes
SHA-256: 0f89fb4b38ddf830487a4d2e22876e9329c6df3c31ed07fc24ad75dfa09e3d7d
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1