Malicious PDF — malware analysis report

Static analysis result for SHA-256 1394cf2a50b8fd1d…

MALICIOUS

PDF

100.7 KB Created: 2021-07-07 15:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: be3c3475befe52775d05597e85c4f7fe SHA-1: 649f6a9c229eab4f60308ffd6bfda68c61cc40a0 SHA-256: 1394cf2a50b8fd1d869a6bcec22ca3ca141f1d3491e961c476ca8c9b28952179
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://krisoc.ru/uplcv?utm_term=ppt+themes+free+download+for+education PDF link annotation
    • http://atallmed.com/userfiles/files/32194119228.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/46748120792.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4e7g4ath5t9atg1c017cqd4j39/81140068452.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079485a6d109---49912725170.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/venupomamanukipakuda.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/48361880041.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fb72579197a54b678128c87a2087e068/mewedapusigorogufus.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/41ed9a1c8b7bab85505e9e2b9a8f8799/39165723826.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8f3ab6476853acaca0efe9f4144d4298/lutobemetukoretin.pdfIn PDF document text
    • http://usa-ex.com/xarolevimepufifexewiwamok.pdfIn PDF document text
    • http://furniture83.com/upload/files/wugisud.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/65351495791.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/77636951553.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aa0ac280c695c2527fdc0f176f3f6158/23684231774.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/50162751521.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/napekumomafunanam.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072109b22c7e---5015074096.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8366f3c8063dd818e2e6a993e3cfadb2/91972602599.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/50093037467.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/72413030858.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/41216471781.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a753d6df5035feb6cacdabb7da653cff/gezanigafetofakutavi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/ratikaxirolojivo.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/besirejozulujinota.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_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 11072 bytes
SHA-256: bd1eb85bda13cd970c04f1f9998b7cb79c41236196253d52ba3b8bf8feb672a8
font_01_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 16888 bytes
SHA-256: 4377040474d7d4ebe8eac47e1b7e1f3a60be1d63e56da4e4c0dfb6a26db15980
font_02_sfnt_off00016d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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