Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80757359e6451ea…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1fbe0703e6b3e5841654a72c6a7e43d SHA-1: e4ada39134f33b4235474b0a0504aa08befd6d9e SHA-256: f80757359e6451ea6dd03dfa77c2c1c66d5ff8496a2e0750278931f9346531a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, likely to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e5hqk5dtiitsh7fc25e82dv5g4/vamejegisajifasilivaxav.pdf In PDF document text
    • http://4seasonstours.in/userfiles/file/dapivum.pdfIn PDF document text
    • http://planetamama.ru/files/file/45947049182.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/19209046768.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64ec71f72---pinekaraf.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cfebe4618d89b00149dc39c47050ccd0/63795825574.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/84273693228.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/12615389208.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/12626901466.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/wulepupamagiwegozazoxa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b6e97aed---lamosivilaxupivejoxutin.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xukadodonagapowa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672eee17cd---82131574252.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/poguladekev.pdfIn PDF document text
    • https://soechi.net/userfiles/file/10276649532.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/238803920975fa102fc73ded4e6598c2/bogagajepaxozol.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e19d8e045fd---62461150763.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/aaa5e91dc3491c793e09686cf796d724/24046851750.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/6553519006.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d87ec597---bugemub.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/ramulazanafe.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rlpdt5o824d2tkmso99g57e47a/19039743644.pdfIn PDF document text
    • https://digireg.cz/upload/29508819262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=frigidaire+stove+self+cleaning+oven+manualPDF 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_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 10960 bytes
SHA-256: 66aa3ba349aa8fcb57cb36defa42b2f21f1020451b451059819ee14992bfbef9
font_02_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 16736 bytes
SHA-256: 180f73f07d110b33925e25c92f9c89769e8d010f9f969dc45392ed272784aa1a

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