Malicious PDF — malware analysis report

Static analysis result for SHA-256 91947d1b15373649…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 18:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0353ca11d4bf64a081910a371ebf9018 SHA-1: 42681e692aed0a40ed2db48d6b1f4693d2edee32 SHA-256: 91947d1b1537364928ecde3850e922725574b5609787d8e2558470f86089c8e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads via the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=watch+bride+and+prejudice+online+free+megavideo PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983479c15c---tejakopedafasa.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/25328371225.pdfIn PDF document text
    • http://gibisch.org/files/files/zedorojid.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/goborof.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/31478854789.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/sinebepewu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/wekikojepedowituv.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/nuvebokojenamepono.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/7443818791.pdfIn PDF document text
    • http://expresskaliski.info/file/37392018488.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe8527cc1a---damori.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6d496979dfb9dd88bf1b7f08fa8556ec/fazewomelikakabe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611756604bdd7---39597783535.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/54907412728.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8b37695ea683b68c811b6be1a2550966/71156346052.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/lifigefajose.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dba9c7b09---fikoduwonegapaxo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bakafitus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a881f1e16e8---76849363268.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/16606914767.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/jamuledere.pdfIn PDF document text
    • http://119pump.net/d/files/libaromonupanepe.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/3838153428.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/i17i50iq1da3imvmj24349sn9i/51797773617.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/79af199a831cdc629e3ed657a1601117/3306776643.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f236f50db7---72260843382.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad8cb28fd---59470710439.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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 11328 bytes
SHA-256: bfed44d782a4d9466df2b43149839d5739157a3a5f0b4a3a5b7e73af0bb3134b
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 17848 bytes
SHA-256: 7ae8fd36a264c48638847192f91e627d4f4029eac95323c635c328c017c075ab
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1