Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44a62e340019c0…

MALICIOUS

PDF

82.4 KB Created: 2021-05-19 23:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c5d095fc1fbd19ff666c3c1ff279f5eb SHA-1: 3a68f378f2fa10b10198e301357c66f4f854f9d2 SHA-256: bd44a62e340019c0fedde477dd80999c1687492d7cf19b57c2f556ebac026ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a link farm to distribute further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18aa55d565---97393897298.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/93e9541fafa85f15add12bb0944e6c2f/81883212072.pdfIn PDF document text
    • http://sns.hu/_user/file/rizotowisatawudaf.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf98ee88c---54303641886.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a336773dc68---gimuvoropitu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/94036ec8da91d332b99a06802a2acdb1/86849644579.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/438f9e4a58717e3b1376aa9917d0dc96/55480714574.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ee8b190ec5e034f20fbafee23b76bed0/3152326950.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f47b1235---pakejitazunisasizigox.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ovjv0s8o5o9p0gp8lpp1in1vq2/bokegagu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4458a8d0428c23429fd5698acfe1878/40961852626.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a145eb05be1---37623199950.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1726c8160d---ximetuvopa.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078404e3ec0e---60122874042.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/79a8fe52d58137a8cc949c40362c6e32/disijepukekofubir.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/BvfzZFkJO3s/uplcv?utm_term=al+arabiyyah+bayna+yadayk+1+pdfPDF 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
    • 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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5296 bytes
SHA-256: 6d58f81be0679d487b684ffbe797edf91b50477513990baba5f66f6dda1f22c6
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10800 bytes
SHA-256: 5abaa0d79a2a35e376f6fab9ad7e0b74740565c4da04809ab68204a4acd3ed7b
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 17664 bytes
SHA-256: 4c9d1800c765201ae2163933c53485583600ca9ef0e737ec788c48f4e4c9077c

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