Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcc40fcd56de148…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 00:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b84cffd10103f5fcfea1320278979573 SHA-1: 4b6e5f38702747bf8a16b683df777908781f08d9 SHA-256: 3bcc40fcd56de14853b2d856af9f3af35b014f89c1b9613009eab1f03eb80049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://constantemails.com/userfiles/file/162993577010603899945.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/57gt2h1tvmurn63d3j97s4at93/pezubaserudoni.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3aad8e1ee---xoluvotivelezaje.pdf
    • http://simonhoirup.dk/userfiles/file/47708135702.pdf
    • http://zaintik.org/files/galeria/files/zibugag.pdf
    • http://www.vljainandco.com/userfiles/files/vomopozijago.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e7d10d82894fb4051f3b238a21d66f66/luresavulepezadojefosiwed.pdf
    • http://twozonechickenlasvegas.com/uploads/files/manexodakeberanasagokup.pdf
    • http://szentimresiklos.hu/upload/file/99926495572.pdf
    • https://gbagencement.fr/uploads/file/70955315521.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50fba2cb0---nurebarimazesapego.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gijovupiwoxotewe.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/55491274773.pdf
    • http://rymwid-training.com/userfiles/file/buxikalu.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b5f935016---xoloja.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/avde1mee03soudi14agtjoufa4/nigigojapoxaxozozepapoji.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3319ac8ec2---28561124014.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/80423822299.pdf
    • http://sochisushi.nl/survey/userfiles/files/fonilisele.pdf
    • https://banghenails.com/upload/file/nibirifipetodolevo.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bbc460d3c4e84ac38c1a7d5920b464b1/puwigifikuvubitujudurut.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rqs92r7mb6vmpnuk9r0qaequ51/mesetafej.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7d428c2b---76558744630.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/cd6v0ip6ln0e314dqojan1en46/pijafefapufelikararule.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c133287dc4f---rofivotuxaletomuweweduguk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=electrical+notes+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_off0000d3e8.bin
b21b66553424eb876727a2243bb478845c78e4d3aed6cc6c8216cd3d7fed25ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 17448 bytes
font_01_sfnt_off000100a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 16792 bytes
font_02_sfnt_off000118be.bin
ec67ebdc8d82f65d62e68d50d0f141433fb0406dee369658fb8e85d5a74dad55
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 10596 bytes