Malicious PDF — malware analysis report

Static analysis result for SHA-256 8233fe48432af582…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 23:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34acfb228f709efd9d00cad1dd134391 SHA-1: 8dcce6ebb4430e118056ee14a58b20f9c665591d SHA-256: 8233fe48432af5829d11b77404a352a3ec0957ca85d2b27611f751f5b85c43cb
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. ClamAV detection and ML classification strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable hosting, further supporting its role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qk82fv23h1ju0hjrusm4fmgp5/40721310521.pdf
    • http://nationshield.ae/userfiles/files/vifurekemenegekidutozom.pdf
    • http://abw10thstreetne.com/uploads/files/wezevuwomitufuvewakefut.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dab51499e---molagirakenepejub.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/71961864738.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040614332825.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/22a160e4894d73ec2ce8c3d04fae79f6/60078091491.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f67281fdb---74468222052.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8762321f6d---53653113098.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/losalisa.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/292770cc91e71c97aa0702ac3d29a871/zofujitozavazabefirereto.pdf
    • http://alkanboya.com/files/file///gonugetofipewexebirodosag.pdf
    • https://coonvalleycc.com/userfiles/file/18202924808.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adff331dec8---venuwowewuratipe.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c787647b56---75822515816.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hptkmrc5494doa9d3hj2kv8ol5/leravoxij.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efd791b92---98473981988.pdf
    • http://provia-events.de/pics/fotos/1/file/xomazibowaviru.pdf
    • http://iaestedresden.de/userfiles/file/45429878761.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/83e83db7783ec59f7dc06e2a74c70269/18362413592.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8feafa384a---38131684482.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+exponent+laws
    • 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_off0000e687.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 16792 bytes
font_01_sfnt_off0000fe9e.bin
43e550628ca83c5f87f3d3c2c345b195c87019c08e2e792c384219cd0a5baac2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10220 bytes
font_02_sfnt_off000115d2.bin
c1a9c9166cdd834868d88c585c2c758d4bf4810c3a57d09a76aa2e5e7753d0fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 17576 bytes