Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f072e003213e2d1…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 07:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2ae6b611f22ed12c053f96092777b5c SHA-1: 1c6b7970601633e6d056a398e30dea0358b9f2da SHA-256: 8f072e003213e2d175718bd1e0e199e3300077e4f0922696eaeb75fc8f7b8b33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting an attempt to distribute phishing content or malware. The embedded URLs and the nature of the heuristics strongly suggest an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120da54dbcfe---53901197840.pdf In PDF document text
    • http://abnicum.ru/files/file/vibumisuvo.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/42190779172.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ff019d4da01ad2180504dff803023fed/tufuxuvasurelex.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zawipelafelafamel.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/fawekanunaxevegedugif.pdfIn PDF document text
    • http://dentherapia.hu/files/file/1527943820.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/27050424506.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/92867185953.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fge6bo3239kj0g9f4h9kdqqmu1/19955829906.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/18255763408.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/964db5f5c17678c721357ed7adb631bb/dagonojuvobasimusexer.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612525bb0f7ea---97176219940.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1073ba08d5---fikisel.pdfIn PDF document text
    • http://planetamama.ru/files/file/18508148750.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/88542051339.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/20162541118.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/025e996002d23a63a511a926fe1420f5/96107517550.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/29457551562.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108110827051893.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a0cc0e18---vewobilebimaziwululaxu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1717c2a87e---88824968318.pdfIn PDF document text
    • https://rosycaffe.com/file/dibez.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/leviduzudoxiso.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/59661465192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=smash+up+trickstersPDF 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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10636 bytes
SHA-256: d412bd9b7dd4d7b6021cb4a471d2ad336221ba5645b7ceda26c8b37df0af2808
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 18392 bytes
SHA-256: 18cddb294c3ad0ad2f12482aebc1b60cb8c15e8f00740b55fb46ce6acb9c42ef

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