Malicious PDF — malware analysis report

Static analysis result for SHA-256 78feb954733a15ea…

MALICIOUS

PDF

86.9 KB Created: 2021-08-06 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7108cca33a28bbd50d9723474db9c40c SHA-1: a3ab149b1b998c4e3ef19fd114a6e2828dd509cd SHA-256: 78feb954733a15eae957cb841e9b00eee36c982e50ef23ad7e355e22a4bf940e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://byocamacho.com/ckfinder/userfiles/files/lutidavadigo.pdf In PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/19654119563.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fezurazunizaneviriz.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bufulaziwenib.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/11197223543.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/gusabagofiboxeme.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b71b360b---844988886.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c48c1fb6c7a3363ec25730bf40cc2045/vubigebupeb.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608151cce645c---84860932237.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/87676908222685ca39c8c1ff58c9cddd/12417641611.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/29692464927.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/lekuvomesinozufiralef.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/3185332511.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/tivoj.pdfIn PDF document text
    • http://www.pvvc.cz/files/54429528270.pdfIn PDF document text
    • http://medica-brno.com/files/ziwedososajojo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/00auvb2bak1276argg9i1t0n08/liwidunaw.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qr88vqvguuop45t17c2hclroap/61883038028.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/52763592108.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/90728937827.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/32770128057.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/71810013137.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e55bf921a3b---susefoj.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fh3cm1bn9irku7jg3fpfjcvf16/zimesojevezegad.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l7tic0o1bv4agaehve9f9o7hl5/34399863960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ehliyet+durumumu+nas%C4%B1l+kontrol+edebijPDF 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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 11116 bytes
SHA-256: 0b135182ee15416dc4b23b90ce0565b3e9c19567732163d15d6b7235a33c08e8
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 18848 bytes
SHA-256: fd3215a4a406097e5f2e8348bdd8de48280942c493f9e855c24fa2562f13c120
font_02_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1