Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04a3045205b3b20…

MALICIOUS

PDF

95.4 KB Created: 2021-07-07 10:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4964d1b80cd01e81e19be4125e0d63a1 SHA-1: b5eb0a45155ac94d637137743875876c76db3275 SHA-256: a04a3045205b3b20ece4c34c645a02db7a13fb9661a3813a10d3ecaa0bbf016b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=medical+technologist+hiring+abroad
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c528f5e98d3b9df116a4eed197672e8/97053041542.pdf
    • http://argyleliquidations.com/userfiles/files/1914782421.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f334806262784abefebc2c8c1d2680b6/39362510431.pdf
    • http://short-story.ru/upload/file/libaxaginox.pdf
    • http://ural-resyrs.ru/data/file/41262861059.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/76e1a13d646605528de6a778840508af/kobivapomolelinikifadon.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/12379238225.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/af6dbb699967bdc854fde9cfd9b8bd5f/59558649277.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/62b150bad3d7e8cfaa638b9eca1926b0/69729074952.pdf
    • http://dolphinegypt.net/userfiles/file/nisurovegeban.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2239f33ed---sujanamedoduniwa.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb56d9a0a5c309dfe3668aadbbb0b4dd/jozodefun.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/de22f45aa6072b7f4f4076198688b184/49830312770.pdf
    • http://abnicum.com/files/file/72548970293.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/83426602562.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e7d73247---68166278539.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/25136288380.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/vofab.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2cf45bb5315b606a02bd8634b71c61c2/fusoxegipexiwizikepipime.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/xazilidowumolijidapigawik.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/wuxonivexipeme.pdf
    • http://blbr365.com/userfiles/file/1621832017.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a121719c503---76719109636.pdf
    • 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_off0001102a.bin
99db78a42ebcf72d2ab2f085d84ad2a962fa2dc87074b7dda42979483151452b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 18024 bytes
font_01_sfnt_off00013fae.bin
66e0d9ced9648603ed6286acce9f3301c15680b0c894979e9a58bb0c9032db58
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 10780 bytes
font_02_sfnt_off00015836.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15836 16792 bytes