Malicious PDF — malware analysis report

Static analysis result for SHA-256 b488cd70f70f25b7…

MALICIOUS

PDF

104.3 KB Created: 2021-06-28 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da477313757985957972e6e32a5f04fe SHA-1: 889e717f5a5ca30357ebc2ecf8e0d9382e508bbe SHA-256: b488cd70f70f25b78cca1a023da19f7211415dbb2b00bbdbb058a86d09c754ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lookkorea.net/userfiles/file/dotasesebe.pdf
    • http://cnc-soustruzeni.cz/files/file/ritoxa.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/46c41f5801c6a13d4de89106436c2237/74941475529.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f6872dc7afe064722125ec73728669f4/govevirufolebotu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/91288h5ap4aunnoe0mjjoj6q1n/luxetenijiruduriket.pdf
    • https://venefoil.com/ckfinder/userfiles/files/kaxusan.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758d4c66de0---50110099135.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d172be---75050471175.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/nerukelisokomezejosov.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770b880373---65541791250.pdf
    • https://benqmusicworkshop.com/fupload/file/zanap.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c049a84724f933131ff5b36e4bf2e3e6/45402483100.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a45692ee92b---47201329890.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f4b49b2fd6f48c1d9dc11e3504ff2fd2/84235165688.pdf
    • http://thedreams.cz/files/60498042599.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7485b97f536a5275b64d49c190fa1aa2/sefijarogoxawir.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c590cfdb0a1---53597146276.pdf
    • http://dolphinegypt.net/userfiles/file/11505081872.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5eba7c9d148f3064379ee60f454ebe8e/bavojexamezivazetajufedus.pdf
    • https://vieclamkythuat123.com/upload/files/vafepoxobatijibezimexataf.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28387b527d776131a673d2a3f6f150a6/fizeminomepapinimoda.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e4c6a3c8ecfb074aee6dedda7fc8e841/77669088494.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d6ed4f07---papufonitafit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=function+of+cerebellum+in+points
    • 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_off000137a3.bin
a41e54a3d0f3ef4bd29dd571fe62dd3a644f0b2cd5f3fd2c13431522410744b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A3 10696 bytes
font_01_sfnt_off00014ff2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF2 16792 bytes
font_02_sfnt_off00016804.bin
311a6d0e0f9c5ffdcbfc1db155dd8610392fa7580032354e4c0ec07b63083bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x16804 16916 bytes