Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f14fcbbd60af62…

MALICIOUS

PDF

85.2 KB Created: 2021-07-23 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e47e6e528d826f0888301ebbec6ccef SHA-1: e8fc8c261c1ac8c9a61d0f4e99f9c437e476a4ba SHA-256: a4f14fcbbd60af62c5c0607c42156fa526817adcdd1181ecb1d2c4ac50fa6f9a
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 file contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://marcth.pl/media/fck/file/66824068560.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/96157937612.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/43144133430.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd67b6781---bebenexijodow.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/puvopa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/44354500305c994c2271de4f5ab25e9c/nuboraba.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/559f52de2c0493cb3283dba10f34e10f/tojuxisafivutitum.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5fe5d875---10479360139.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kifomenimufewipure.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/kavepiborunonabemesikivo.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/72525687266.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3h5baa69786r61k83ms3gjhj1/45748706951.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/40097135993.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b656a78---pedabawobitujubigogo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g2lae0o6ilmm9c1bmq8orpv7v2/kufixizalepenipomodizeb.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hkqo256knur29glc5ko9ts2bu4/97139119750.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jijuraxi.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/492ba6f48e78090ec42b2435d41021a9/96892105419.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/nudelagofuwadage.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dusunuwedelibokinoxoza.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/308990af78f956f33119f9fea5ebfde0/30830021186.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/41452618140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cuales+son+los+recursos+naturales+de+guatemalaPDF 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_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 10752 bytes
SHA-256: eb86306afa0d17be6499e56ad7c88fd63ecfaf38c30b1daed8984f37c3314ee8
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 18756 bytes
SHA-256: ce6112b6bc3371264194e52e9e8de6ee275231573e50eb2102dac06410d9eef6

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