Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f28b1b3f4a8b373…

MALICIOUS

PDF

87.0 KB Created: 2021-08-30 14:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c2a2468b79a1df363b849860195bec7f SHA-1: 98ecc896ed83bc809df49774c418418cc457b038 SHA-256: 3f28b1b3f4a8b373d83afa3b595c316524ab16ff9a8591aa69364a4a2375a665
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely to phish for credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emiem.pl/public/upload/ckfinder/userfiles/files/73408802601.pdf In PDF document text
    • http://naucseto.cz/storage/15160151642.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/25743448912.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1310d37c7---dakus.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/jorerazizemuzamij.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108280413075353.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/zalomud.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/25116514789.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/73415888066.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681c17cbe---10773670884.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a937ca4b---xixowozogago.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/eb5772ec2ee0def86c34cc83e49fef90/6180139296.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5566aec001---40592844870.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210718/file/16266052873471.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/linuzopidobewimejolupajaj.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/db64b6e0e8c48d83db31f2a9c9af1188/74535735928.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a944b25dfba---25863004482.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d90fbd32fcdf937fa563f42e85f14081/jewelegigogefelijaral.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/80371656121.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/13f8e8cd3230aca999e53ebf503fead2/93861431127.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/katizobupo.pdfIn PDF document text
    • https://tdfstore.it/file/90802836694.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/34973967333.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xusoputegitizowuvasudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=faculty+of+science+coursesPDF 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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 18480 bytes
SHA-256: 7a1a2942b65bd390e49b17e7bf18ec8438ca37f3a5f9c8b9d0096a52956f5435
font_01_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001354f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 10520 bytes
SHA-256: 75d6aa809fd8a731550781bcbc9a678ad6fee8c2527d9aaee98f555f0c457b81

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