Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b887a2f489623…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 01:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a28d8d30df0642d41b8b4b8f2da92fb SHA-1: a95fa6e7ae4b8d7e361b3b7909e0ff36fadc8f1b SHA-256: dc0b887a2f4896233f7ce8f1bb939a8d30f2f6614450abcc477f65eb0a366b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. While no scripts were directly extracted, the structure suggests it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ln8qnrr95ig31i0rpu69neqoej/bigen.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045112aa3c3---16380036716.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c095ffd06dc---vuvawu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8t2renh2k49266li9917snva53/99919560450.pdfIn PDF document text
    • https://digireg.se/upload/sozututexivukapepibusuwer.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/gulupuzolefusojaje.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///9280294541.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774e5b97adb---51072944539.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/381211459.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b6f0bf6218102ce9c6d553f07014c65/56309009432.pdfIn PDF document text
    • https://adikketiga.com/contents//files/5964205001.pdfIn PDF document text
    • https://ikima.fr/uploads/file/silelizopiremideku.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892f92df338---nolatepugamitikoromik.pdfIn PDF document text
    • http://anpo.vn/upload/files/63768230631.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b4b210f---weponokivifedufupazemafu.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/68690456873.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6017014826.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/v0k396cciols5va7gh6chrf8qv/90017183415.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a833ab92d01---8711605391.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/63067073012.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d528dd1e051---gusira.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/ganusa.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/pilasimemiweri.pdfIn PDF document text
    • http://bjjiffy.com/upload/supazibogutatud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pictures+of+lightning+bolts+cartoonPDF 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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10856 bytes
SHA-256: d918df6665ec561096572464ab7c8c49eab0c7c77381dfa86f852c0745cb2373
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 15908 bytes
SHA-256: bb31931c1bdccf3dc49d9fae6f5348bfe7b656d938b6ac1eb33394b77eea0082

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