Malicious PDF — malware analysis report

Static analysis result for SHA-256 620131fcdfff464b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 11:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aa59d447f08fad00f76b04e0190c3891 SHA-1: 84b9436b1d76a9f7ed792bee4b3bd45dd4b4b205 SHA-256: 620131fcdfff464bdfbbe235c5898715161d043e136141fb231d5e494fcaecfb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent number, likely for a tech-support scam or billing fraud. While no scripts were explicitly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads, suggests the document may host or link to malicious content, potentially exploiting PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://easypayindia.in/userfiles/file/kafekalolit.pdf In PDF document text
    • http://sparkpro.lv/content/file/zowigawariserakim.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/28435940448.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zomutotokit.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/92690614881.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384829a7a73---zewimimulikazoxepek.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa994d02---74619297268.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/87479894289.pdfIn PDF document text
    • http://chinazzjx.com/d/files/81004426827.pdfIn PDF document text
    • http://regcureguide.com/files/files/67037949932.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/senomuperafikijenitozuna.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/84960932229.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/45618031675.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/60576278815.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140732678fdb---14054837845.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/tojanidulodibupon.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/75292338062.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/22635388657.pdfIn PDF document text
    • http://finchamauto.com/pics/talupedawuxajozifelazug.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/70609022036.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d81bb826---kiralokezemazatojajonijis.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gikuz.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71027292863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fido+apn+androidPDF 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_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 9920 bytes
SHA-256: 583c68609183e52879a9d07fdc1d8583d38908a8ca7a5e58d02b54dc620095f1
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 17888 bytes
SHA-256: dafa2b0b9979aa2802dd8647fddb09d9300c99766548ef6a9df71d7a1aab9577

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