Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b555a4d2ce4cfd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ff2d577ecdc7c34c2fa832ac36883ed SHA-1: 530433a8f11e3e2aa8aab3bf58a75a4cf2495614 SHA-256: 20b555a4d2ce4cfd51866cbb6b650b4ab451197660164e96d149a9a5140082d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=windows+server+2012+book+pdf+download PDF link annotation
    • https://inverpalmas.com/aym_image/files/11666859944.pdfIn PDF document text
    • https://deepex.hu/hirek/files/ludakazokuwox.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/88677499123.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4d0b9d0f---60126313224.pdfIn PDF document text
    • https://highrise.pl/file/xezibawu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/53342007557.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160899c076c010---33105629110.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd0808db9---76941459352.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a8dddd50f69d427074f2bd30754745e9/xusuxesuvagolubugatowog.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0cec1c288675cc0af5cc3834cbba7b6e/47512922441.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8299e22203e6159a57d3c50fb80ad4eb/jedigev.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/mevupudunasizuwovovima.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0a1cba606f4ae9f83f599ecc05fd71f4/7027352514.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe70a0d726---disekanekosexelekukiwama.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9ab449d7cf98d01a0eeebe08b0ff735f/loweladiduwude.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/kuzenut.pdfIn PDF document text
    • https://shinaltd.ru/images/file/2795777037.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/93826071110.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/lezakuxotiguko.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/lawemi.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/bupeki.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/visuxig.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa5df3802---4786125816.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/97857483028.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/fuzidovesezumof.pdfIn PDF document text
    • 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 11064 bytes
SHA-256: 30b2e31756d90fb9d9a6cf96b2b725aad46582fa3ad0d462358e25cecfcc90df
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16936 bytes
SHA-256: 716e74e03d62234564c94f7ddf30f3374ae136a3651ee93de548e8439ad5cbcc
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1