Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7c37f63a1e64fb…

MALICIOUS

PDF

86.2 KB Created: 2021-08-27 17:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a2d4fda637068b80ab179a07e573cf0 SHA-1: 7fd0ff977cf99b687e5b02074fa4ccc46e565649 SHA-256: af7c37f63a1e64fbcf7f58510a121d547344529e472b12220aa9d74d864a685e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://mbzgogo.xyz/web/img/podborky/files/fufejozamudepumeturoda.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/10356824119.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xowadugamagubezonuza.pdfIn PDF document text
    • http://topas.lt/userfiles/file/6832687878.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/kewatifizabuxufi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba287f27b7---98624168934.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/mamafuz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d898636b9---revuwukutabe.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofogojaxipi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072360f6b839---34096355048.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac736fc5b0b---18046886644.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d9ce0789---19298555432.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/51131685585.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/62669683520.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/jusinekoxi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f50qalhc1t4b5vsbaa2eenl8o2/3504956175.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/ruwipog.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vumojepimepanam.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/18918383482.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa0dfaf852b2586337fe1bb7708b9c09/95227443357.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/puputelirop.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/jajukogekakubulitelidib.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/difepimikezigonimexeporef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=6th+class+maths+book+with+solutionPDF 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_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10752 bytes
SHA-256: 91cec75b1e390ac8d4dbd45416f955ea5ce49cd5188930ad081a97b6e9261113
font_02_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 20164 bytes
SHA-256: e8002fd73fbe46a5699bfe59e2e1ecc1d3d74f8dcdb6ec60952e19233d47349a
font_03_sfnt_off00014253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c

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