Malicious PDF — malware analysis report

Static analysis result for SHA-256 7156e86db8f3b866…

MALICIOUS

PDF

115.5 KB Created: 2021-07-04 11:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1a70c084e259e2de0a6f056b9b53f2f SHA-1: 57839c8973d227cb63403b3c72daaafd21bbb2f5 SHA-256: 7156e86db8f3b866d9423a3fd98824f6b480949aaeff53731858fee66d289588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2de3ee3a7---mupafefinuwokumazavis.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b240d106f---wezug.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae82127e5---89801469053.pdf
    • http://barsugo.com/ckfinder/userfiles/files/7186153893.pdf
    • http://wo-kop.pl/userfiles/file/kopuloxonejobujo.pdf
    • http://nova-auto.com/upload/xubimuzivifikudu.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/lavopenigenekudiboxasebak.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0dbb384eed0aae59d82afa477271936d/mugexixarimorotibunupowur.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4dd7689c---sojupevopiluxabejavu.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/35a1488340c057891b8255df6829ddb7/19883210926.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51f225785---33184997414.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713d7666b2---mipofasuwupenobabaxogi.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/vefowijaduxenumuzokot.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/zisujajawajositago.pdf
    • http://laweasy.kr/userfiles/file/zuwixa.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/81297977845.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3bcba7b9d3207bda3eeef8f97ddb2789/85281616947.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981e1284345---rozitef.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756e83adc46---70054587513.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0d9ce57411f8a562ceb78a687316131e/didow.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dnhaq3ek5b2lqa3j2piap1vadd/rufoguzadanoxa.pdf
    • https://efnnma.org/files/file/febitadobafir.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/86655739881.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/79725322732.pdf
    • https://hoalavender.net/upload/files/4599232566.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=as+per+our+conversation+please+find+attached
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb9.bin
383708088c8a2a879616132258ee1808673f2885e381e79ec95c0941f5ac0312
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10864 bytes
font_01_sfnt_off000117c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
font_02_sfnt_off00012fd7.bin
b54f699540909866a4e71fc1abeea83734137f11c76ed95e21a08a2a75b87237
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 34336 bytes
font_03_sfnt_off00019044.bin
027ce41beade51cb28349b34686a2f1610f21ac4593fb8d2e26bac141a82d4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x19044 18064 bytes