Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80cd862939f2b8f…

MALICIOUS

PDF

98.9 KB Created: 2021-07-02 17:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc140746b2f760157233a4b1d2fcc973 SHA-1: 76d346f6356232f5a64e3362ef974cfb419385c1 SHA-256: a80cd862939f2b8fb9103303e2ba5ddcec87f21e7334d1f344c15b9e9201bbeb
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 multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs suggest an attempt to redirect the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3aca02583---gidikejutapavupifazi.pdf
    • http://aelma.com/sites/default/userfiles/file/xivufopudesi.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e31a57d5c---93226977042.pdf
    • https://steklo-shik.ru/userfiles/file/gozepakikasuditin.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183ff8dca2---nababafotuxomamemuv.pdf
    • http://ideatity.com/ckfinder/userfiles/files/34267344108.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/ssgc0mug2f4t1js07sk5fap9bv/73950542618.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/89055734938.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/renebelolabiluja.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rme8ufh6uenbjf5nt0evhrjump/tiriwatamaruguru.pdf
    • http://www.520amis.com/upload/files/54640669193.pdf
    • http://reelproductionshd.com/userfiles/file/bezaziz.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7b98104a---9107426256.pdf
    • http://sosnovgeo.ru/userfiles/file/5335095650.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/56qnmlbr7h9bma3ref4k586js5/58646345992.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d11212e4ab454c6fee3e1f2a49a23d8b/97994928488.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/bizakuwonetosetome.pdf
    • http://alnoorcity.com/userfiles/file/52347708537.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f1lcoc4q5srrnlh9usnak065ri/ginomajaposawatama.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec1602fc0b---sirigadapogoxuredibozudof.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5adaa5319c5c4f9d772ef77b8eed93e2/64841850401.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/61f5e3fe135e6bb8ed6b8daf709817e8/29875015187.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3201b5062a---62979982501.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inquiry+approach+meaning
    • 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_off00011dd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16792 bytes
font_01_sfnt_off000135ec.bin
0fbde09acca99c58b208c49a507bf45ee3b7a77f19fcb35723b965ab6e0147ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 10820 bytes
font_02_sfnt_off00014e52.bin
679bc2864aebb90961614aa691136985fcb6a868e461769439d915b25c21e082
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 18048 bytes