Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c100b87669d793e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 07:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1231a18b39577bdfd80abdd338211472 SHA-1: b5f505ef30cabf50ba4b2f209fffda4b91d3311a SHA-256: 9c100b87669d793e6bd9c2dfee16e4e3622f3ca100d37d56a1086d72120c3c30
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://allytemp.ru/uplcv?utm_term=campbell+biology+in+focus+3rd+edition+pdf+reddit PDF link annotation
    • https://stop-remont.ru/ckfinder/userfiles/files/25789783253.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/19e46634e894f1ecd671018aab99c6c8/jakelubewog.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a59c5ff333f3683ec518c221e13d220d/98085134487.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/976e6e658772c48af53db24354959fda/papokutezilamiwasupax.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd645fbb15f---19741822912.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/72039804310.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/roxemobilexajufoji.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/33931693886.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/sojolenaxosejixeduwuniviv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e375f30a---84288939943.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/32444580396.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/xixasagixikema.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/wekajasepulasafoxidimu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a39d758452b---jikebiwapusomefeme.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/wegoraliwujadejajisamo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1f76607aaf79964a4cddcec3b33ddee4/37791230733.pdfIn PDF document text
    • http://recrute.fr/files/files/48971814253.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6147caebf56054ba1a3f7cf9bb47724e/nilabewute.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/wobujizanejosekejez.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/015f85f44696f58ed501d31b8041ebb4/66791609461.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/ravagadezagudurawodizome.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c741cbc15e---komewituno.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d02e5d828a6---51067757741.pdfIn PDF document text
    • 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 18968 bytes
SHA-256: ad2706ae19344d7b1b40995eaa874329df738bcffc76b312c1a2cc4cbaa2a35c
font_02_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 11520 bytes
SHA-256: 09846c7b4ee35f0c7181a03f2a3a1ede4e1f53a1b1d1f5570b559e25196f4d91

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