Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86a3bed942e15d7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 06:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 385852fa7ecca3cac9537033b0ca9c9a SHA-1: ad03bba72505bb1b60560ae541aae0ef95f1e874 SHA-256: f86a3bed942e15d74654fb4eb3c7858b49388bf745f7234cca44163d09161f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://asbu.net/uploads/FCK_files/file/49839480832.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vkldlr0qmcckg20cbmmturbqp1/reloxabalenujulomu.pdfIn PDF document text
    • http://splogservice.ru/content/file/6653582664.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bupazut.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/46607506374.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dddecddd9d6---mamogawusewezazemuxinibe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2ac951fa3---37445160834.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dapazus.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0c64531c---15680589093.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d703109c881377eb4cac89da93f044d/88907209765.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/66144531826.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/90436772802.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/11415794620.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/59458584260.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/lonikiborutajiridefises.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/parutefefa.pdfIn PDF document text
    • https://strechybenesov.cz/content/2276174497.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sedawamegojurav.pdfIn PDF document text
    • http://geodez.com/pliki/file/gujibogogoted.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f387be0ff0c---26186367103.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/59354766302.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/javogukov.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d842e564ed784645133080cc4ac3f34/pepiwuwunokejozaluxefamu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43a690ec6b---nemelomuwidog.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/vuximufal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=solutions+intermediate+3rd+edition+teacher%27s+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 11496 bytes
SHA-256: cf1da4d3aacc32a8e0a1676896a1d4a81d57cc3c6de0659fd784b83fb730aa34
font_03_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 17728 bytes
SHA-256: a971006a799e58bab97ec2c9e762086ee643675d3c3f3eff0544ccada43e398e

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