Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dd9121d33a0287…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 10:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4c172ae34db2667b89a703a65293320 SHA-1: d43628073a12c410d0e1abd148f10b4e3b5b4007 SHA-256: 58dd9121d33a0287724ea9f96ab272e47a747d010fd9e462334b50715d06d05e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6613

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.bufolari.com/public/immagini/file/pefunerutanategivubidobe.pdf In PDF document text
    • http://collegium-connect.nl/ckupload/files/xiwugefufopazomu.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/94848374840.pdfIn PDF document text
    • https://beautydent.hu/editor_up/80732692389.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/mavuzupaf.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gekuxobo.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/putejezikodu.pdfIn PDF document text
    • http://short-story.ru/upload/file/zivedagekukolajawulufiwug.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/14004759619.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/kimowazusujupewitumuna.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53262777456.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/edf893fbe7408841a8ef8b192fca79a2/77507608511.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/visile.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/63816010187.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/59874403678.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nj9fnfvaevtdf1p7hosleh2c6f/jelujubububasomegu.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/basopebefinojorerozow.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/dirijorinumaliva.pdfIn PDF document text
    • http://belean.pl/userfiles/file/xumexebanovobebadafo.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/61406255025.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/61302944169.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sikljsr8qa1tnme2u9ja3s2hpd/29843443606.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/jepodikoje.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///zurobogojivomigavinizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+app+procreatePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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