Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c6a62dd9c6031e…

MALICIOUS

PDF

73.4 KB Created: 2021-07-31 12:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b98fca043718a4ad8aaa68da78af1945 SHA-1: 19a6da500e4482602c2f219e3fa1051b72b038c9 SHA-256: b6c6a62dd9c6031eacef59340a2823d73d2b85770377e90e23339fb46e74ae6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggest it may exploit PDF vulnerabilities or employ obfuscated JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8893

Heuristics 5

  • 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
  • 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://svltv.in/userfiles/files/zazavu.pdf In PDF document text
    • http://medipharmacompany.com/userfiles/files/namenobomijepu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/16931375348.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088628387191---11045757903.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/jilizak.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/25128434848.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5b28fa37f63e3be6c8c3b56387b955ca/35838157769.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/fiboje.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gawesiwexezowemezafuta.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820893dc2a8---65750253690.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/21273660399.pdfIn PDF document text
    • https://jambukuning.com/contents//files/zinurubotorup.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nksnjt7aht6ltoib13o3ip87dkeb016i/naxusologozazepusutenenuw.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/394559458.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6lti0ahd721g37dut3urp7s3c4/jafuwibaxuzukubop.pdfIn PDF document text
    • https://digireg.sk/upload/75621737382.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/121fq510i4ullm8igabtofocj3/rinugasitoxif.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/galonipinerituvemiwe.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/74dno1hries6lo5do5mvnv6n5v/61847055002.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ab8e933c---gitaguwirawamebe.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/duzolunusulezubutorek.pdfIn PDF document text
    • http://prosquash.by/data/85992826485.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/zipijoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=global+credit+union+loginPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10656 bytes
SHA-256: 43ec778b36f0ca5d0812707b8254e3d51e3c93bbe4738d401f9582b59ac19282
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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