Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4050d2527a7ca3…

MALICIOUS

PDF

85.8 KB Created: 2021-08-31 23:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fcfe41ffb037d0bf3cdd627f25a61ac7 SHA-1: d6a712fa63812a7ceda68acddf0f231f6d06c1c6 SHA-256: ab4050d2527a7ca3ae50462fa121085f62d46fa5769d2260930d35a304fb05fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of urgency language in the document body further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://alatheir.com/atheirwsfiles/file/kasaga.pdf In PDF document text
    • https://villadorottya.hu/uploads/frontend/files/xivewonedox.pdfIn PDF document text
    • https://jss-moms.si/upload/File/99681082429.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16107879b9f7b0---pebujakelavesezajogopar.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/zozunawusuzileg.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3aecb7e4894b9118f90a5a90006ad585/21508200075.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36087515011.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2d915218f2f8476ceb013e5e35c4651/zeduxewesifetufaduvutibi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3052dd133d623e5c0ed0beedd4d06313/99849100743.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c67fe54fa---30753757926.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/d189544d9e59f056dd98e119a5b2d710/vuluku.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/94967025656.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/bibemegobuduzidevivazelaf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611267ff5171e---33298904732.pdfIn PDF document text
    • http://airmon.hu/images/files/donokiritegugis.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/bulijonemuxoruxofifus.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/besapus.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1dc446a53---fafamapuwofi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bffca313eb4a90496370fbf9040678fc/sokufixizor.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/265536183f1ac9b3c87b175bc1ce9103/kosukulufopu.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/wolimutisat.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jusanepijin.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02d1ad145---76536742989.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/medatepobobijovinisu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72484950499.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/sopitatevodamejufinitiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dadagiri+googly+questions+with+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 18016 bytes
SHA-256: 3d3869603e465e2e83014356bfee9489819fad89ce911019d0fd74c39812f93e
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10972 bytes
SHA-256: 5b1a057ef6b44a7694abaa898180a24a8d2c9c195953ea73d9fea0333c4af70d
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1