Malicious PDF — malware analysis report

Static analysis result for SHA-256 5420d65b41bf8242…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 11:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 902e0100a23a45e8f3c07b658d8ab9f1 SHA-1: 70be9a491929998280532b1dd8d1c5cd7b3644d8 SHA-256: 5420d65b41bf8242e67a04b2f57dd2c29f193fde5de9de9c4635441dbea074e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and compromised CMS upload links suggests the document is designed to lure users to malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krusomying.com/data/file/zanab.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0dik637ttaiorb42s4iof2cjeh/sojogi.pdf
    • http://seanmore.com/userData/board/file/85285825731.pdf
    • http://vom-ragnaroek.de/uploads/file/voresenunepupe.pdf
    • http://koreaseowon.com/ckupload/files/fokewokagipux.pdf
    • http://tsg-edinstvo.ru/userfiles/file/libubesajinap.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/miramoburekigof.pdf
    • https://learningsolution.ca/userfiles/files/nenabigafopapisa.pdf
    • http://thinhhoanggia.vn/Images_upload/files/roviv.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/80524e2508f09354ad3738fb9887e82f/zatatubagitajanopij.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e351f3171a0c3c7f335f71f8093a6ba6/kexerupaburejesusig.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6kd89n81udr7i8idsstr1umjt6/roxutiwomosusemoxuf.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d0e6996425d90c1be97d08da908818df/bilalunu.pdf
    • https://maftplayer.net/calisma2/files/uploads/37548973488.pdf
    • https://silverbirdmarketing.com/pages/images/file/77125688908.pdf
    • http://xpeedon.net/userfiles/file/20210916202401.pdf
    • https://vpmemorial.net/images/file/80264795596.pdf
    • https://moveo-sport.pl/userfiles/file/sozogufizelize.pdf
    • https://gitedu.in/ckfinder/userfiles/files/18634867765.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138aec99e3ec---89618616900.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8804c42e---22463237462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=block+site+pro+apk
    • 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_off0000d2eb.bin
59ef14b1da7c3ef406fba06f3b6611bbd083cc6ce113b3e6ce3125b8d4adf8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 18144 bytes
font_01_sfnt_off000101bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16792 bytes
font_02_sfnt_off000119d4.bin
6dd3e0f9341dc832a7d680bb3941f8d5838085a1ef10fa7c61253517c9c801d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10408 bytes