Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57434ca22bfc702…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 21:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8889f2440921c4b26b0061d167d9aea SHA-1: 67c84c18d0f32bcccf148d996c32c10529ce0d7c SHA-256: a57434ca22bfc702e7e8dc821098aad667dd1bbbd21bc3d0393cdada67acacf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The primary attack pattern involves using these links to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=double+taxation+treaty+kenya+pdf PDF link annotation
    • http://fratellilongoni.com/userfiles/files/45355856349.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf19079a0---mosusexokeregudoxufokoguw.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/sorezidifozibomutibax.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/jodujepewajakijad.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c45c98535---29616001577.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/48f72fcc66f0b530aa4c7132778b26e0/jivazobimis.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260b6930b8---34148068763.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8564218c8f92e6ff15d617c5a13d8e4a/94986052738.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/jumogene.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/10074582809.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/2896974435.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eb9ea7b66---dejubibibovosopovud.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/gozovodepakupowozi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b1857290---xakowosuturawirimadiwa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sekowopif.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e96c875de9317eedd50ca38cc6c36957/pagivetesaxodu.pdfIn PDF document text
    • http://614move.com/clients/4890/File/pukipunubafifaferomedit.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/savozuvazepasod.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/gufip.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/xogiba.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_184245.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6ab590---58993638114.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/2025239059.pdfIn PDF document text
    • http://gazetavk.ru/img/file/pajakeleregokitudasilize.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160833a2ec95d0---62625255564.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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 18080 bytes
SHA-256: efb368d1337f3743fe8af67e417d5aefa44118af6b67751f14f24d03db67063b
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 10872 bytes
SHA-256: 9a78bb664252301025df242193f8288a4b10d5bbdb4a4232c548d58f4b258788

Open this report in the interactive analyzer, or submit your own file for analysis.