Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea8240cec90dbd3…

MALICIOUS

PDF

102.8 KB Created: 2021-07-06 07:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 187ca6545f3054118003607caa7d4960 SHA-1: 0d42c81887198cd5edf945d0b14a45bcddce37dd SHA-256: 8ea8240cec90dbd33aec5c7b1ed1e80131cb2f281552534a6b8c63b7b1b3b3bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/432f8c8411e332c18f0b7910451d2615/36540774160.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d22a386a---koluxigajodebumovexolizu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4870feead3---xugatoberewukirenedi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0m76qrq2roh7ps7kcj629hcs3u/vakuxizexuxulepewo.pdf
    • http://poltinik.ru/userfiles/file/renilirafegex.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cvskbpivts1s3jeranhas4ha7k/32315137168.pdf
    • http://phuvuongcorp.com/luutru/files/tuzaganegewoxemesugof.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/05988674d34fc0d5648e37941547d815/38297224105.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9bd76ef8---sezuzenevine.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4f0e707767f925c44b29068d63860ae8/tanowokaxutovovur.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1da0a06d59d3619d86401148fc87fd04/javixuvotirug.pdf
    • http://greece-ex.com/lokogafovewivagazi.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d1a5fc820992040a8bc6d588a317d546/resuxetusojefu.pdf
    • http://0965818789.com/CKEdit/upload/files/21677465438.pdf
    • http://dynamic1984.com/user_file/file/57716001100.pdf
    • http://etnorom.hu/pictures/84783146617.pdf
    • https://dancleland.com/img/upload/file/zezumuxavokalaxutufuzigej.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef2ba4859---22016199808.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f248200---89519499887.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106171354153658.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8170db46f---62148350165.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fm06cgqag7osgtqqmd0udvkh91/94763138543.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/raniwevopifofuvisoxutime.pdf
    • https://repare-ton-smartphone.com/userfiles/file/86074932601.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=why+am+i+getting+fat+around+my+stomach
    • 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_off0001258a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 16792 bytes
font_01_sfnt_off00013d9c.bin
e67345cab3e4467997bc389bc3808224622e42965a8ef8a7781d4afab04e0e67
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 16940 bytes
font_02_sfnt_off000168f9.bin
1a6de2d99a46a0fb6ab8b65f5ce105b3b503180c36f6e2fddd7e2540a370048f
pdf-font-stream PDF embedded font (sfnt) at offset 0x168F9 11084 bytes
font_03_sfnt_off0001826e.bin
cabe2fed004bb8067deee1dcd87a862767dc77278bd13b314bd8d5cbc3a2b911
pdf-font-stream PDF embedded font (sfnt) at offset 0x1826E 2520 bytes