Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d0f37dc5d73931…

MALICIOUS

PDF

86.6 KB Created: 2021-07-29 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3210caad7ec0f36241520d2d8373167 SHA-1: f37708be79666c742ed3687c47be9a76afee39e6 SHA-256: 06d0f37dc5d73931c4e68cc58e95744ca1da15b4e105dccc75f5054cb754e15b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://consulcongress.it/uploads/assets/file/85861496423.pdf In PDF document text
    • https://aviseco.ro/userfiles/file/88556115649.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/05fe61b6b660709f474faf7ddffe3c1c/gowemu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/juwegevedisuzaz.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/wuribukajejosobeke.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd0587dd1---3456102792.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/58782541497.pdfIn PDF document text
    • http://rts-3.ru/upload/files/99823610517.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xenavakonoxorelet.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zazebepoli.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/28961232808.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360e824a3b---jumozogimuno.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/pilazibadokat.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279269be21---gavefaj.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/lexapow.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/todowezuwovixexezodo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/79050840624.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc0db6ee4c---sitibadebak.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ee543ab4e5ee6bab1e3600f37ce7617/nibobe.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pikc83ji0r40b1bmmmf236n1bd/91854799878.pdfIn PDF document text
    • https://advik.net/userfiles/file/98418639290.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jidifexugafikomafidig.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sexavibejoxol.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/19079554943.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b03eb52624b0e5bd7db550ef71404b60/folod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+cost+of+discipleship+bonhoeffer+summaryPDF 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_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16252 bytes
SHA-256: 98b127db7adb43e79efaa256ec4325b498d163dc8dbd163c35650134cd0c175b
font_02_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 11200 bytes
SHA-256: d5f49bab3cfaf5844332d4b3bd049d60e2d5e7e0ddc357f744bb9c7b3ca754bd

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