Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a9dc018523c82b…

MALICIOUS

PDF

83.2 KB Created: 2021-08-16 03:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d336c22de381380d5943b89be32d3c SHA-1: cf7b598202dc6a444459c68d47434edcf0bb3cd3 SHA-256: c3a9dc018523c82b8c2fdead1a3ab6314c98b36967e598aa122c5fdb5fa1dc7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/36c7bf2f9fc9a0a1a4578c90b8338f35/pobigomuromemisemew.pdf
    • https://ehlibeytalimleri.com/resimler/files/2587888763.pdf
    • https://larioenergy.net/uploads/file/66862157506.pdf
    • http://hyundai-baoloc.com/luutru/files/86849059689.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9d2d0680---29926796711.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/52005077515.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0c5434bcad4bf315f5407e6e912bc077/fapekebonan.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610901490e669---befoxev.pdf
    • https://salwangurugram.com/files/12148507994.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16109c6597d0d3---47284852335.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e28b1f37---24245697474.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5ad2f73d---pabojebonekaxowevidije.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/67486830202.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p4vceej5f1vp351gqt4okkb3n/73562104996.pdf
    • https://baglab.pl/galeria/file/jedekiwadef.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e52a0f805a47f002c2924390b73bfeb1/15940746277.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/budibivomigiwimilivovul.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/xatagiwefap.pdf
    • https://betalinktech.com/blmedia/file/xawolubi.pdf
    • http://rbtyutj01.com/userfiles/files/jujiniferisomobitel.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e4f37f1e3e491c8768e7db84767e6410/ruzelage.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e252e93e0---73400375236.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff40dc2e0---48039081008.pdf
    • http://tate79.com/clients/868750/File/93756494164.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+play+cracked+xbox+360+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df68.bin
79c26363a3f00bfdc2496849c58c83f395a1182c9be760e790e13ba350154f41
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 11648 bytes
font_01_sfnt_off0000fadf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16792 bytes
font_02_sfnt_off000112f1.bin
fe218b7c4b7b8bf84ceeeab54050dc5186b4e0db841eb031739ea984ed48bfa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 16800 bytes