Malicious PDF — malware analysis report

Static analysis result for SHA-256 797dd4c7d3b1c2ab…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 13:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99337cbc2c591ea15d834c151b116823 SHA-1: 73fb068522a0ce21771cc7f2a79aa21e6e306533 SHA-256: 797dd4c7d3b1c2abd814679928ae83ba5647e7cd68ca6a15d2dd0a22e984c53c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://4grd.com/cmsimages/file/36194713566.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/zupugopozibugamu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af8290496dc---18438777130.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e7f8443e5bd875308a558aad61c9350a/98095315200.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/82065128626.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6kbtgtuu1l8nbfr0efl3jht70t/86890808514.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/076afc52d44f7f2b197de0c5981d4b36/50011166890.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/46334460422.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/51572086607.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6rdglnaq8dp8u6olj6a2p605d6/kalebividijiditenevobawo.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/lexuriliwezozamajidoluv.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/66627402508.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/mojiwonuloxozesolikuzu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/kibonujobujujo.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kadepa.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b48848c---weketupimawujosusomiju.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0896d4d540afeb7f4353f944158896ad/88344874042.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/35597327662.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/15298728186.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/rivewikabusereburerosufo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64097312076.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/7952870089.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99792470517.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1j7qfr1d544nc6sceqoejmp27i/zunijeziduluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mooren%27s+ulcer+pdfPDF 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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16608 bytes
SHA-256: bbe9eeb2d40b519debfd641938ec196b27bc8469185a52ae70b7174166ccf21f
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10388 bytes
SHA-256: 77ef7253b0555c7c01872104c457cab6a3792f092b78e06890a808995d33b52b

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