Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15640cb7f6e4912…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf20abd749daddd43ce5d194751a8ea7 SHA-1: 00d5238aa74ab8adf38586f0529bb4c2ccb45c8f SHA-256: c15640cb7f6e49123fa9807be915e11faf9c415f634f30c20bc4679be7c949e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into initiating contact, likely for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f41dea40---bukimobujiwudopefowepoxe.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3802203ef6346e240a4177f459ce0c7c/77669781590.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/bixidosifew.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d216395898---vegivukofasokizisoduk.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b0793f6d4fdbbf540585c8067fcfe157/bewofuvo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f03ee523---rijax.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/juzofe.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c0b5daf8d3843c91ef9e9d9413826043/teresofaw.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/muzakukivivuveragukif.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/29583648451.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/torirawunoki.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133a395465---4347843638.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/savamex.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/tibonebugurusubinuron.pdfIn PDF document text
    • http://etnorom.hu/pictures/38989989654.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fuzividum.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff1932cdb---vatofanelimulizi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96febec3d---88209129618.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rojopoxowixumosezifadu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/22451525130.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f04ef9d6---bafuvexenunotav.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qhjfnaqfm81ve0c2u7g7gu05dk/66639780248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mac+and+devin+2PDF 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_off0000bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 10008 bytes
SHA-256: a909f5d5684db2f452c3137d8f33bde1555d5e08bfc413ff289f116e8a1624e6
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17540 bytes
SHA-256: 2a8b5948698f607e570666eecb4205b4bc3d9c65686f2515ecf8ac464ea10fc2

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