Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be4c23c5ce64d55…

MALICIOUS

PDF

93.1 KB Created: 2021-07-22 20:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a15f4600975130bf55025fae250b05ba SHA-1: 90f2a7501d9788bf912dd6021321be3974f97aad SHA-256: 0be4c23c5ce64d551b15a109e9bf37f802546afc7eca890993dcd1d53c0aaff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous external PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic of using disposable or compromised hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://akcjonariusz.com/UserFiles/file/98084087518.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778920c074d---mawonimudirubekomolivuf.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/rixikesur.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pilosidakikegekidolikewoj.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5e7868422dc6be3197b9ef47f4b093e2/9203647181.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/29098757688.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27669ec76---46049485800.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4bd8f25a---dudujiwajobefotu.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210629_AAC230359897F057.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f910f0eb005eb69d42e0c73f12a9ad33/49097370474.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tivaxazesegufakotu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/gewilikoza.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4c5baa36---14940492614.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/fasugozukagudimesaguk.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a0790107---nakil.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/84420368939.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cd533d5c---gujurafewiz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bb62f0b99f46ae3f67747fb9eeda5bfc/judikinejifezafozibegutax.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/riboliveka.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe7a5759a0---volagoranadupavud.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/385abaffbfd5669152ce1f348b1b2b3d/12290217263.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/21517218431.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a19b2dfe1d6da3d54d4ba6cb99437c07/37907813377.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/37041331317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lease+payment+calculatorPDF 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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 17168 bytes
SHA-256: e445762be534374e8ef7792da75f9ab86608fd74db6c9a138a7f2d12ceca0eab
font_02_sfnt_off000137b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 10616 bytes
SHA-256: 07e647ea71e34cb4bdceca82d5df343e331dc1f7eaf43b5b8098206b528ee80c
font_03_sfnt_off00015004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15004 16108 bytes
SHA-256: a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b

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