Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c54b3217699fbce…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 06:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fde55482892eaaf6fbbdd54ce7095d3 SHA-1: 4f355e849b0acf70ecaae0a26e64aa62e2882b53 SHA-256: 0c54b3217699fbce66614ae3ad6d5e2cc121edf2badb1f807bb7f41a0e7dcd5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm on disposable hosting and compromised CMS uploads points to a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79b4a1f5e---xedofofoduzosu.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/47451217583.pdf
    • http://szao-spb.ru/images/news/file/zipusabivasodewane.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7bcb3d9a5---kiwojigul.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af3ee3fc1---lafejapevizimubiv.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/13f187pfcbd7cvq8ag7dj2k6tj/rirapurixaxem.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d8ca14fb172b6a8cce12c123df04acdb/51425509262.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba93eb14b---66258613072.pdf
    • http://cementfeet.com/userfiles/file/gugidijalavowinedanufop.pdf
    • http://bensonlandscape.com/editorData/file/pededup.pdf
    • https://okazdedziecko.pl/_files/Media/file/ladolomowal.pdf
    • http://axwelindia.com/uploads/41707318291.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/lonajifolaxizu.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/xosezalojuwe.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/92112270807.pdf
    • http://asesorgubernamental.com/images/file/72853501368.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c1f1db01f53a4fddcb72e9e156ca35be/74266794434.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab16c9487---75879168673.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/ragubazikixigifudekoted.pdf
    • http://nowyhotelik.pl/userfiles/file/92682303256.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b053fbca42e---bakawojez.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fe1afa2314b19468d17c9970d21d7489/radibuzepoxijojezimuz.pdf
    • http://bronia.org/userfiles/file/garoteruxufavepelem.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57lgil3amjukcvaudji2c0b0vl/zakosavizurigomin.pdf
    • https://ancoraeducacion.com/images/9614802378.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=level+200+word+connect
    • 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_off0000dd12.bin
8bc8e1eac53c11b433e958bf3addb49f088b82f71f2a8a3429c28b0f5cf9481c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 22816 bytes
font_01_sfnt_off0001150b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 16792 bytes
font_02_sfnt_off00012d22.bin
d5bc52f3eaaafece7983b2bc85d1098ac8f4e3d3a8413581d97051682b25dec4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 10292 bytes