Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83df0f928fdfe53…

MALICIOUS

PDF

89.7 KB Created: 2021-07-12 23:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f7b185e274c07c7411c54de935652b5 SHA-1: 6b449462557b28c9a695995d00eb0a275f25380c SHA-256: f83df0f928fdfe539bf472aadce36708efa94b981b3a9f98484890d635768bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, as indicated by the numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://garglob.ru/uplcv?utm_term=entry+level+legal+jobs+near+me PDF link annotation
    • http://ncdesign.it/userfiles/files/godemukegakesukifu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sk5jdmunbs9le6k1mapt7rf69l/24687916026.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6767e3f1---53087212618.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giwesi.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/2814212768.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210623_093300.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lomudawipaxofamotef.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/41466112442.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/318238ba770bbf5997d630f2ff04a2f1/94165360322.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/nirirapu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffaaa4f656---luluzepabe.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608289b30dbe2---xosirijifewojo.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/63086829251.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/nugelitera.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c78799f2---13172129046.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vakofegibojaxawugek.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73142d381e---vivusapitabudixakodok.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/30183876551.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zumesagozi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1b49c6da---49883446729.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bccfae7b07---fuzigatanota.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/91db55f473e2f46aa7da39041129721b/39531956663.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/28149968966.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/45353648554.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/48172295158.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/livazerewopividibivuvik.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609743687e542---kezatopufajur.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 17500 bytes
SHA-256: 2052eed185ef5aea373f361a3afd3a0c2b56d3a0740c45dc8815b5e5da777c0e
font_01_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 10792 bytes
SHA-256: 774f14cd8832cf548b9f01cad564bd982d9ef99984db13875d41a91cf3cdb983
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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