Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fe22a9415e113f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-06 10:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c01eef66e9aed4a4bc7fe098fd7d4d3 SHA-1: ddc24cfb748bb68b14a083714ec8f9f07f7106d8 SHA-256: 37fe22a9415e113ffb5a4de54639c468c8a88e513674ae5f7bf68fd4d23267b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=organic+chemistry+3rd+edition+janice+gorzynski+smith+solutions+manual+pdf PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ueaqnl8u1k1o4o90b4a7db7f6/90708176478.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/843a662634bd72f45d0c69692fdafd1a/zobikumirujorasisij.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210704_1F3C13A6A7AC22F4.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/74878902607.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69978022206.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6ea63ec91d1b65d976c17dcb000e4e74/32862742517.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fab1893c876---nixinalupifuxu.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/dajeligapo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zedeki.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc7cda7d3---gujavobilogi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3a98a6ca68faa029ec414911fb2265ca/18317218141.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1de8f854c802a54524c6699c401d6329/93473293211.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/namupibuf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c0678f47---xuvizapifenetuneketugilal.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/mezovutumeravutunetalimux.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/31067663474.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qg6c6k9693v88qut2s87cfl4jt/47009367597.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005903012d---12271503241.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7cfb6c554---20975677103.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8779edb8---zokazuvoki.pdfIn PDF document text
    • https://alutat.com/data/file/lalixi.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/xawunesupadevunijudo.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 11760 bytes
SHA-256: 26c2d34626909c4adc6ab12d0913b1edf2200ff897543f2af5e64096af753dc1
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 17620 bytes
SHA-256: 48b281f725eda4307c732e95e4cdcffb50eb9e6f9cfde56a5e04e9a6f748e324

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