Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c3d51472a57ac…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 06:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16f88e1db1a7359be9330782cff05b9e SHA-1: 3f28c45a2c7b9c9e4e1ce9b995a1b09f87b4c06b SHA-256: 4f6c3d51472a57ac3833139692433a200eaff8988a3561b6dc2cd7d9ba930c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is identified as a link farm, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=alif+novel+episode+1+pdf+download PDF link annotation
    • http://sambometal.com/dataroom/file/94435367363.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/13461370571.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/razuzufatorewimawu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fc29c3bda8a6866a09958ccc29212fba/togakiwivabu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/xibuvake.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bc5c961f---90329933870.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/17313474146.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/zomasurigik.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb7b3e2a7---76063194708.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kujepanogodinogawakiwija.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/24084233949.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25199301140.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6d152b428f2aaae7cfc1992664910604/43062829389.pdfIn PDF document text
    • http://arslanemlak.com/E/file/povozunatorisuvatajufatu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e469149af4---gukirixesuwiseluneleve.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81c1c961---16953669224.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160de4266ad8b6---83012799334.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cf19d0e2466477a36619c951d9369a6c/bobivupusufurofiletozig.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/87768559104.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lasalavarapolifu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d387b4b453---gaxoxomod.pdfIn PDF document text
    • 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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 16536 bytes
SHA-256: db07ba5fb967d04dcfef0c7f71d16afed080f0152e53a957f6ae98d2258f7bf9
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 10480 bytes
SHA-256: bb076257055bf759338e7cb02cc84565569a9dd3794f081357d51ddec7083ef6
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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