Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1377d308011174…

MALICIOUS

PDF

94.4 KB Created: 2021-09-17 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 617b412f4e44cf86ebca69338a9bbc07 SHA-1: d6f8da239c2840c0e3f1ed4c488106779e86897d SHA-256: 8e1377d308011174598118892745ae3b54e93338e6233f1973e14f7c5b01582e
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search results or distribute content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cfa669442a3ffc89a0f9addf8063ce38/54954812909.pdf In PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56876192681.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/pevasirolirilupaluxu.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jevuzidolo.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/13753993598.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/wuvugok.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/terulutazomom.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/14929624280.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/25931936277.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b92077a1f---77607584934.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/lupebupa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614093acb37d9---34069476256.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ba476ee8e26dd962fa04b1590e501761/kutuwuferejeniz.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/16316152669.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/76333234025.pdfIn PDF document text
    • http://offerparts.com/upload/files/lubasonunorerivexebakoru.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/43845264492.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/68280923065.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/27952314638.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nejimoxozuretelibej.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/boribeboj.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91df99c44---fovew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161417075702ae---63513843451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+quest+2+walkthrough+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_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 20372 bytes
SHA-256: e8636ad41606f6379b2cf679bf2af441df256f0379239610f4b84e6cd7e63afb
font_02_sfnt_off00015276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 11072 bytes
SHA-256: e9774ececaf38d74477cb9118760693e2a34204bdd2322e71b7350d6c32fa796

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