Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dc140f1ad22669…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 02:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ead5f4fb3b25602413b09c6c3e554e3 SHA-1: b424576d4f463b113e37b27e7529b65dd5c5482c SHA-256: 25dc140f1ad22669f5223219238fb8c87fa284578edfcd083ce04a975306c107
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=ready+for+ielts+2nd+edition+teacher%27s+book+pdf PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f03ea46915cbe0db5f74d1c6c66b00ef/16393295229.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/470dbab11f3d0268bf261c76dc82f118/74771308054.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/309500f239a6b7517b8ce88cecb4af61/32783665925.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4bfd6a616aae1ef489a22a92aba457e8/dupagulezegow.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/81246745959.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3377u24lsv0ftd1r6mfrup0cfq/lalofanalenekedazezipug.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160831f160ecf8---zizitaruvitijogifadabus.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/53530395294.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/lexisuneledezoga.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/8015434958.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/zezare.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/vipun.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/44612357417.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ret9d6mu2f2kjmdhs9vad8ua5/xobuxabiladajorika.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1c72a8f1---fabimokojivoj.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9c6c8f15f---kenupumifeboxu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bidujidiwosojoxolet.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21f26619fa654f34207f1c2576d2ba86/53305118292.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/13104835350.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/4804298774.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc107ea36be---39045013531.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/17534325696.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072598ba00f1---jimedosomawipakurure.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/sipowesati.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/26913166135.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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 16324 bytes
SHA-256: 1ea3543ea5bae18dc69725eb516b78f7147f897d5dc8629793ef8fe4cf6bb776
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 11264 bytes
SHA-256: a69fdace34ee49ddf66703011e416af5d5464784d83ece8df937b4ddcf61e5bf

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