Malicious PDF — malware analysis report

Static analysis result for SHA-256 326fa99b2ec57a4d…

MALICIOUS

PDF

95.8 KB Created: 2021-06-29 02:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0bbc2bd8ebe3c6c1b7cf118febbf575 SHA-1: f0f538c2f3c4c0098bf538b1e76d8aba90f709f6 SHA-256: 326fa99b2ec57a4d268f0d546a3ddbe4477a0b52d2b8629893b0e52c101a77a4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of a link farm on disposable hosting further supports this, as it's a common tactic for distributing phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/n3e2kaboajlsag1386736l1pl9/gubafavazemisivosafizij.pdf In PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/figomijewomonola.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ja2gopvm6naf8af6v32007s314/sizujexe.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082912b1eea9---63440472478.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3194f83356---68535471892.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d12f43613---vimugetazilujapiku.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5872a7e2---bonutogimewa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d57b55e3---vowexujawefobinuk.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4jcrh4gfj4dpl1j46lj6bqu3ug/14666641392.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9760a1af35fa7ac408b3edc8803e5674/wolod.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/60718551428.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b1ba3594---pivanigimunevugeva.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gubikolaxiw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a061b93a1a---zonetekaxenikaf.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6df484226---36731564850.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b14bd6e23---65918273183.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f00d636ce3b56892c756a32849c1223/68772158370.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C7C116308D6.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/zujeramikonezutadojebize.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607282565aabe---96460995944.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2f37bf5ce9a0700ae870bd30bbc58ddb/vinumubetejaxomopirowu.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/demijodegomijowuril.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ia7lp53p5ssdi7lr27822la7h1/13614326508.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/gegefejobefon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+a+person+sitting+in+a+chair+back+viewPDF 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_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 11124 bytes
SHA-256: 6ed9a791d019b2b403aaa0f9f8a4bb82ac9148f257aa2f42c59edf2f789f0f67
font_02_sfnt_off00014340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14340 17680 bytes
SHA-256: ecd2a1679b9f3eee2b27e2e703857d5906c90d3cb0cc83bf4aaddda95df01554

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