Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d1742919132ab4…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 00:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 86ef917c0430586d2006fd64282b2f11 SHA-1: f8d797b0d036294092bda04a62a9125fc84dc3f9 SHA-256: 80d1742919132ab44f8d92b888b470c6eae80db779a6c134cfb8d3b55aa7b2d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites. These links form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn directs the user to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f8ec33ed---kesizimudezezireban.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ece4237c550717421c3430808356d854/zaxumajeg.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a9709ff6acaa9870b627633f47bc0bc6/57266951742.pdfIn PDF document text
    • https://isleo.com/i_photos/file/rotet.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210620004722560041vu9zlo.pdfIn PDF document text
    • http://partnercable.hu/files/gufalasegoto.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ae9533fef46103d0d278be59fd274ba3/zafapuzimuv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7c21ad50b---zinasokuripexap.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3ab42td6bg68ol1mdvgi3lsd71/21134447289.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd32eec4a---14023605926.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/40c2f6de4bdd67d4caa15bbc053675dd/diferab.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/48a3a6bfdf346abb959d94b8a48288a8/kaxarobewe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/20056021825.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gavekumimoni.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/tegidefenuwifuxevo.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/zenugoripefekavusujetemu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/85417210719.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/66440895462.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/64498703534.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5sed67tsv2dektimrmt1k1lpb0/82955766754.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6f02c65b---55537682385.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791740cb321---tiwusomogumodexi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c23e12e5e1ba1af9dfedd79c72d8b50a/41976040538.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/65242882408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+move+a+grandfather+clockPDF 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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 10896 bytes
SHA-256: bc319a42d6db6630a00bee19303a32ed3525b91c67260a6db949dac5762a4cd8
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 16728 bytes
SHA-256: 393ba286cdfa6c3b79972503d084ae39b71381e02f04bd6a39a596cbfe42d924

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