Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bb8022bd445d06…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 09:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba0504d5e509c12ba85df590f9a5a21d SHA-1: 303188b7d511ff3a5845dd847a76e697b16f7ac7 SHA-256: 31bb8022bd445d068a1528d9136ceea7d47b0533f16bc12666fbda3ee6de654c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is indicative of a phishing or malware distribution campaign, where the PDF serves as a lure to direct users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lnk-creation.fr/upload/file/pubulivi.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168945c0e0---75144043435.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/zojodefunu.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108310536529403.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7e4644b6---85210905106.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e125c910bc2---71945147435.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d302fa04f15f116cd143c7e0c8c8a32/pogonipuzijikavakezusobol.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/tifaxezez.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/puvamukepabo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584abe8ed5---83262310846.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/54969d4931a3fe7b4a519321eda1fda1/9490397069.pdfIn PDF document text
    • http://primaneighbors.com/userimages/xowirujiliginetapekoralo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e326de6c---43232935719.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/47014259338.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4a42ab505cfb2e870babcdac800cebfa/binasi.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/batijamezirepezadat.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/rukovorebozozoruga.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/92a87975dfdd4683033d401235d4eb37/2133392546.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/xafikegedinujomawaz.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/30693397142.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0b92b482dca92b16ed1170fb6cfca75e/27894649778.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93db5bcd0---mitasew.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2099585e42ec7ca0342497e50071c223/mujejabonu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b296cc68b83---voforepituzokaju.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/guvobepixivubobideleduput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=used+chevy+ss+manual+for+salePDF 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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10840 bytes
SHA-256: 65a93bd7f1c9fc75604cf6462ca7b1f58a23cf4b4b4fe20f2cb0149ace8e2434
font_02_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 17804 bytes
SHA-256: 59382df1c81750ff13d3aa3b80489f816392d5ccb347f29d8bfe723e4db0f01e