Malicious PDF — malware analysis report

Static analysis result for SHA-256 275cd79dfd71a74c…

MALICIOUS

PDF

99.4 KB Created: 2021-07-13 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa8a0f0b96354463abd1cb3cf31487fc SHA-1: 3ed2f5cc3e07d345f0884943cab3cfecb4cd0f95 SHA-256: 275cd79dfd71a74c071a054280134cbbb5e6d241d7d0167c9d6c5d1c8eae21fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crewmak.ru/uplcv?utm_term=what+is+incrementalism PDF link annotation
    • http://airholic.com/UpFiles/WebEditorFiles/file/65572619977.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0bd7r50reqv0n9casoqtv7jscj/kibalolifujeranogibuf.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757edd19dfa---99493801261.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/konafu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/10065436255.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9c3625bd---71163755343.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1ef88528b2fb45298c74a63be5a730c2/retoravorug.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/14096477487.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d5c893f55c923cf7c3401f86ec1e00e2/80706900522.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d689603dcf3---padubel.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5lb36rpo9ev8tt7ik226bb1l96/66425320305.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b6e40f73---ridagiwipagivuwadini.pdfIn PDF document text
    • http://medi-sen.com/files/files/56190746715.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ckkn39e25pl7lc0n88op7h1jp0/7824686793.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kebubofukasewaj.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/jewawamusopatogaxewew.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/331164e7002dc5ac208d599cbf85d8e6/poxedugip.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822740597af---lujatadibulogotizogixet.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/loribi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3f5e5e1b.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160739ef48bef6---wotujemovobapilag.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d478f5bb3d0---fejabore.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jm0dbch7ftlir0jn0g2sq56511/xopinutat.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_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 10368 bytes
SHA-256: 444287178c3dd095cfbdac9f006b97a59a4eccd5edd565f01a157dd4f85e7bd6
font_01_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 17432 bytes
SHA-256: d6334dc3e7ed76790f7a36e5e63b8d36577e789108c89051552bf3d1231a2501
font_02_sfnt_off000168c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.