Malicious PDF — malware analysis report

Static analysis result for SHA-256 272972dfd459d738…

MALICIOUS

PDF

118.5 KB Created: 2021-07-01 11:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d40bcb42eb99c66985f13df7e4143fc2 SHA-1: ef07686cb21a97e454c8fbfb41681283d1b38d85 SHA-256: 272972dfd459d7385833a405a7932327ffd83a98e4b91deefe1f56d7ca45b651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, specifically targeting WordPress. The embedded URLs likely lead to further malicious content or phishing pages, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c629b816158---59154385164.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160823c67b7b5d---biwekuvegival.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965bb133ad8---busurowuripura.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/233d5efa99b0a70387f9e465b74a55c1/zepixisimoxiguzulofub.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52257772467.pdfIn PDF document text
    • https://network-italia.com/file/vopepuzegixofupexa.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/75968190589.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b6f80d7177a9167a0d592071bad0313b/liwir.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/topoxudobefif.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff32e56b5a---sapizuxoxitedegariwogik.pdfIn PDF document text
    • http://paliukenas.lt/i/File/kugemogu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f38ab67a---gutelezabowur.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85da59490---govibidipipolo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/8484793211.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebe2cb05c57c676b0050bf84922d9366/69101880309.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098304062eab---tovawotasewapijuruga.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/desejedojod.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/mejojerekexuguku.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kazowuzegekitilabet.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/11087521318.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7bb89490---36892050919.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/25705952504.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c171244f28---tabaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+intermediate+in+organic+chemistryPDF 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_off000152d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D8 11096 bytes
SHA-256: 0738cebf0e593a4d7ff411a5bccea059286c94f4d9b2d2c1324247ad2a71c081
font_01_sfnt_off00016c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18477 18560 bytes
SHA-256: 169abd129dc53315ad8ba5c4a5c9ec854053d37451ffae157e8fc26ad71fb357
font_03_sfnt_off0001b594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B594 16320 bytes
SHA-256: 1922f6fe86992c8fb0d09ce0b5b8093773c49b582f1ab243ce813c2fdab9ed83

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