Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f62a5b44c1ec64…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1a57ac1f40e0b911c68c9e43650a1e1 SHA-1: 81cafe7a825ea3bd7d44969cef4f0ab5079e9942 SHA-256: 46f62a5b44c1ec64233ed4f7e34714c8b2ec8e9d985a793cbaa8e10bc578aecf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting it is part of a phishing campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512052143181407.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///pufimod.pdfIn PDF document text
    • http://temple.mo/userfiles/file/82240232406.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a91eaf7fe00---81727802895.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/bajijajuwoniv.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/92dc0f1bb08ca5a4e690d8eadc35cace/58698549402.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/75748550627.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/1077560091.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f1a83e42a491eaadeba792e59aed6b7a/9649631515.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/87ed98a5f60be3c2278d7e4cf0096290/48335438578.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/48244523217.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/66109543375.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaace4fc58---28292268627.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rovubenanodemiwikugiro.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/29671272954.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86260664559.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/525fb2604d472122edae264e97770103/3090138238.pdfIn PDF document text
    • https://studiorampinelli.com/file/dejesele.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wikekekidapisadi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02c55576e53c941652f114b1360a1662/tiwunojufanomunokok.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/23476678416.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/vuxozizigafaxuxawisonog.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/92688bdc7892ee37ad442858f6f93ef8/ramanubukegojakezu.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/48383644018.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ee4ddf3---somilugegapejatanativezaw.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/2301164883.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43166763076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kill+germs+with+heatPDF 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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16904 bytes
SHA-256: 7a2c6360443d0f995a0ed14b1a10a1615f341d97c2eef93e93ca8052135cf1c3
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 10408 bytes
SHA-256: fc99333de05490fa9027886878e9ec97e22ee5c7058f75db06417ec48fbbd3ac

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