Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9149dcec24a3156…

MALICIOUS

PDF

108.6 KB Created: 2021-08-11 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6cfdaaf733fdb2c0d4649ba1032e42a4 SHA-1: 9e41f3e618b663d04c93e182af3dc8ac963c4e10 SHA-256: f9149dcec24a315651589d90256f7126cfc762394e5bb25790ded767ea604e77
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The presence of numerous embedded URLs, many on disposable or compromised domains, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846a70db4ab---ximuxoviluxi.pdf In PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859bde4ff5---66376694277.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b2130f8f38aabf0db0066a7a4a69a1f/55822320835.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jopubewadisadujaj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5rsb64fu2qnedtn9ksch6261p5/papowekapewivevodagavatir.pdfIn PDF document text
    • http://byecook.com/ckupload/files/nuralujiritazira.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b360ce283---87868556793.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ccee12edba8de43c9d1ad223ac09973f/xagaseloxopug.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/modefakemeveresikinuno.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bobobenizitaw.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106201222085479.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/48134717858.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/joporufi.pdfIn PDF document text
    • http://standdominica.org/files/files/jokibokijurojefob.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4kn86mcdb25a9jilbq119lahld/40337966653.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/40452959611.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096dda3951f3---kakuvaje.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210620_051020.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zikibavemuzizedimesi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e1a9f8ce569f4453d314875fb8208ff3/jikapikipojumafeju.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0b256b79---99024537362.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8c58513641b1bb65ce2a5328f4f2f822/56668662481.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607325558a84d---63645448425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=does+england+still+have+debtors+prisonsPDF 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_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 10880 bytes
SHA-256: 2c03e2e4dbb38a1332f065938e8e49d67b49bbeb4c87569e87cebbdac74e7026
font_01_sfnt_off0001576e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576E 20316 bytes
SHA-256: e8657e5b68082fd64eca5c7d37a364c40250c43470a0f2ae4322ce8e239cab94
font_02_sfnt_off00018be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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