Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aeac1352bf269a…

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 10:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ed79e30bdc89a66ab8037bc1cfc1060 SHA-1: 5499ff1213598aa0038f75385ee3a1774e82160d SHA-256: 25aeac1352bf269aba1f65b2beadf27b57fa59c6c49a6d16d0025ca7d9eab087
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://its-bulgaria.bg/files/file/47066068354.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q2norlrp561cau85dh5pah95id/20786136999.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vd77imgl1jcbmtpr0cjs32elj8/vopuketunak.pdf
    • https://mabuksusu.com/contents//files/dalazeg.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa755d859---14400606572.pdf
    • http://pwr-tech.ru/userfiles/file/17581304598.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c1a62da0---52504498176.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/79644160765.pdf
    • http://atol-res.pl/uploads/file/dadavigizun.pdf
    • https://vivekanandbawwa.com/userfiles/file/49110190602.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ctsnal9ff5vid3qb5mbksrb7e9/84910247557.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/89ea31268b459b5bb64cccae13d9e071/xifoze.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd580c01e---70958084960.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607611741a96b---22084900496.pdf
    • https://room12shio4.com/contents//files/60218798017.pdf
    • http://yjsyrj.com/userfiles/file/8347120165.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094049788baa---77005589289.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/05149f5a60c8081d1fff4dd3b2676429/37955196382.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fb178fb6---bavasuz.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2j9u8247o7507pqej82aud3s72/wazunarosigug.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0afa54575f92d622177d29e83d8efddc/21760860685.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609412461b52b---80489967863.pdf
    • https://codecs.roimages/file/nenedewovew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+producer+funnel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f8.bin
c3ed2ff77dc5ba34603a55d297d94c6eb0ba55630a06285a2b2cb14591298066
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 10260 bytes
font_01_sfnt_off000127e1.bin
627803e31676e850a153a001982a11cbae4a59803c492ae07441ded4e57d7c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 17596 bytes
font_02_sfnt_off00015557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15557 16792 bytes