Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51194538f12dc0a…

MALICIOUS

PDF

91.3 KB Created: 2021-08-30 23:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 796d0039bf822ec658606e743eeba40d SHA-1: 76a655888cea12ff33e0381e6242f544b36e942f SHA-256: d51194538f12dc0a152dcf2e950d5509d4b45ef1a7111c2568877d11477d2757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=how+many+cards+in+a+standard+deck+without+jokers
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bee32210ede34b0c867dd219a2e7f790/nekivuxigotudukoralipad.pdf
    • http://flygarfield.net/userfiles/file/mopafuluke.pdf
    • http://air-ned.com/uploads/files/medazevigo.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b959deb4---rakupegiwonuki.pdf
    • http://giustizianuova.it/userfiles/file/86884954382.pdf
    • https://mszukam.pl/dat//file/fufugufunejijinitasu.pdf
    • http://nwatchonline.net/userfiles/file/dagunamamuxebowepuxi.pdf
    • https://myphi.biz/nbloom/fckuploads/file/85981776341.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3njpe5m8lptcsnagtolhctrj5q/sunudaroluto.pdf
    • http://azstorestudio.com/uploads/files/wodukuzetopelitonoxoguvu.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/feguwutetezunizudakuni.pdf
    • http://hvpeds.com/upload/contents/file/53995799841.pdf
    • https://marcuspietrek.de/MARCUS/files/file/mumugufuzumu.pdf
    • http://kramor.bg/userfiles/file/22126343191.pdf
    • https://jf-orvalho.pt/userfiles/file/nitabirikewavoke.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081809fb3acf---35391759156.pdf
    • http://www.ondebiz.com/userfiles/file/61532596569.pdf
    • http://qamsar.org/userfiles/files/wabaxedoxiwi.pdf
    • http://dogable.de/userfiles/file/wolukeso.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uvbela2dl2dsppq2euk9aif0n0/76889147538.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gqhldtr8r1fij4632aps07l2u4/78120799452.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/evccc35aiebba4n9ttl5qpk6fg/74420774157.pdf
    • http://rc-modeller.se/images/file///21138459290.pdf
    • https://birotex.rs/images/files/pujozazewoxowowojijojina.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8foblafuu219s8hj1otphc0nb4/rexibejar.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_off0000fd0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 16792 bytes
font_01_sfnt_off0001151c.bin
83ccddb65827a8635f47d47d7383a5e9f5a5af259d5365833f1293bec3fe2c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 18284 bytes
font_02_sfnt_off00014474.bin
2f6a8f7b0dbb3820c6935ca4f1dce638a13a397bdb9e7a9f0ec9a483a1061f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 11104 bytes