Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d81b3f909d7f2ad…

MALICIOUS

PDF

66.0 KB Created: 2021-06-19 10:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5c4fe139bdff3d595fa0ea95c401ae4 SHA-1: 9675bf4b7a60c338055685ec7a95a0da4275433d SHA-256: 3d81b3f909d7f2adc9fce91ded6b284baed85fe3f5238b1d75aeb47c6f3c5996
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains text related to PDF to DWG conversion, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://eyetracking.pl/userfiles/file/bomoriwalidodivevod.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/kenepurewod.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rhoqmoh8la9smqv1br50luq0u6/33447078286.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pukebizobebuzusujarokarar.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0464bd38ff---57010662278.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/pudanudosikoxiwadejozi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/7of9tie238ql865hpu3a7u3f27/14970563423.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/81644566059.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zotas.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c88ceb598---72240066622.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077605a9d7e7---votakex.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/puwowedebakebosopikotu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/56056923190.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b88b8af4d---82071657694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+pdf+to+dwg+autocad+2020PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 5444 bytes
SHA-256: 10dfd5b13c24e7e65df6c022ad84b18eb2cf9d1e2599a2bdac457c2b7448c55d
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10064 bytes
SHA-256: acd79c92767be74dec08d66f6eba87ab506a07b7fe00adf514270df6ca83b73c

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