Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42e20c6b2611e65…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 05:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19df649d7861cdc3fdfcb3af66a506ec SHA-1: 270e8762c261eadb02ea68341db71b4323eb90a4 SHA-256: f42e20c6b2611e65f3596aed43076fcbc6e448ba960fe84b2c1fe4ab582d57cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=webview+android+xml PDF link annotation
    • https://taechoclub.com/FileData/ckfinder/files/20210908_2F73D42573D72C64.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/38911844173.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/3849802577.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/84580911024.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/lopidabo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9cdf39569---wotamuni.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/64683285853.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zalalalozuxutur.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e04f1053a66618776d0e64904a217246/14369007664.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/xutolefasegaz.pdfIn PDF document text
    • http://guchen.ru/d/files/wiliv.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34cf43dd0---mimovipajiridosiginup.pdfIn PDF document text
    • http://iltorg.ru/upload/file/vezutizaxuvimumak.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gozozewanaboxolevijel.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/67066430299.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/bogufaruxabotud.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210904220234_c3VzYWd1cm96ZXphenVyaQ==.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91dac87b3---xaxamidazu.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/43119025414.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/bepolirezepatosalel.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/7193566322.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/94801692648.pdfIn PDF document text
    • http://retrofotr.cz/files/file/webafeduvolubezagojaki.pdfIn PDF document text
    • https://partetesal.ir/data/file/67843801269.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a4c169bdf144f6463962f99819447d7c/82844477867.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_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 14256 bytes
SHA-256: 437af442934876bcb13128632b92ce79c1c0af4e80d3073581af3a99d10c8308
font_01_sfnt_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10532 bytes
SHA-256: 54d5463d8f7ecdcd5b30420c2ec7d3af7516656710cd9f70455e1faba61a9c34
font_02_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1