Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78481a6215b2ce1…

MALICIOUS

PDF

95.5 KB Created: 2021-08-16 04:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: adb825943d175cad45e9f1ec407cb811 SHA-1: 5a606b15a0209bc7a70e4a40b523ade00dc6361a SHA-256: c78481a6215b2ce125cdad244cd2dd033eed5d1fe93636b38024d6e01ddc3659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e1547d40032864ccf91d3367a52c415f/bumutuvariwilip.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/kotipadaxarateliwe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9771d7d3af---96356885431.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2f022b1deeb44b6bc0cff32fc1e824e2/zilevojijawogajivej.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/74243800225.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/51812975064.pdfIn PDF document text
    • https://silga.ca/userfiles/file/85510955271.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/75817032341.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/21448630992.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/dejewefatipukotaxadoni.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jogolazave.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f6d91d55a0047304246f0cab1122d15b/90514479894.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/lidovi.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e01500942---59054786339.pdfIn PDF document text
    • https://hssanesteban.cl/files/4823289995.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/rijesoluvajinapumiz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086cdc7364af---napamugazaxivokakaxo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/272231383417.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5bbec5dae7659414f8e85fd0ce03306/sixoju.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zewis.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210701190321_1gjyfk.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0854288c9943990441bd886ebd3cf5d/87998738807.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0ad951f6f6---jipatagivaduvamigamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=comic+book+storyboard+template+pdfPDF 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_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 17508 bytes
SHA-256: c85344e8dd9b05032412afe278cdf033006a7b84ee7f4ea5550918a87b66a470
font_01_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 11052 bytes
SHA-256: c605464321c96983e6ace070a320368e4335613cea2a5b2e528b1c2ac5f79e65
font_02_sfnt_off00014e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8A 1864 bytes
SHA-256: 5ac33c8e1e50fbac8ff1c15c212a7cb1fd58f90f7c9afb1088a9786b979c3348
font_03_sfnt_off0001574a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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