Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a666a616cd045db…

MALICIOUS

PDF

78.9 KB Created: 2021-07-16 01:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0871206681f39b4fcd898c6bb1dc6204 SHA-1: 9bb8f8efcc114cacb8315a4ff0e19f3ecc7dc521 SHA-256: 2a666a616cd045db38ab378f01dad0fb5efa7a74196f3b25f3e1412e283dbcd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pngroup.pl/ckfinder/userfiles/files/80541189221.pdf In PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/92170059542.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42949669835.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/38qmpji9k1q1nbnklpnqsdibl4/17435043657.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/27573440365.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/kowixumiropiponitovurik.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb783aa52b3---27255889942.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c739f3acd---daxejin.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c32940ba---4270706986.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/50548927285.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607548048539e---novosilase.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/9124259388.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f4f46604---ligerutilulunaloraluta.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b95bbfb0e3f---vejefonimeligedetedipa.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ead8e06e0db37672baa85824308e3c30/mafimejubotodujafe.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/51759887518.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xakutazexasokewo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dfbf8e49ded79349c190ef6d43596ebe/pesutilefimojufuvob.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/vulufapixurufofaxawa.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/13785824450.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kcheg66uq89tvvrlmcl0ni9ef7/61549321750.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/76552653797.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/48249719136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+draw+peter+from+family+guyPDF 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_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 18048 bytes
SHA-256: 8607c3e91b0a26894034973d254e816993d30846e7b214257669cf7afb1885cd
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 10860 bytes
SHA-256: 21a0dfbc469d58eaab670923535e8a979f93550280dd13743fa14a9965395af0