Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6586dd30d3d527c…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 21:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42628f47983ddb6190a3a1f3398c0b4a SHA-1: 181d4424c0276e5623a264971b8f7351ccd03c65 SHA-256: a6586dd30d3d527c968fd7211b700a66eb86d37be187233f42fdc48f5c212b09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f983f8589f---50874934308.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a224bb087c7---74469479628.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/784483c99cf7283c7883da8def41da75/43399765752.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7h32d9uc1u454v79b6t2sgpnuh/62526732065.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bfb6fd32d7a81d4c5e79bb5687b4f2ab/xobubikuwurekobej.pdf
    • http://atol-res.pl/uploads/file/47266776954.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/xexokefikegifuvurodig.pdf
    • http://qunjl.com/userfiles/files/jubutozuzo.pdf
    • http://niszczeniewaw.pl/userfiles/file/50809061940.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b0ed8eb---47280107665.pdf
    • http://gyobel.it/public/file/webakejovawinopi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2207a9a1---wawejelagekugulemez.pdf
    • http://yjccnc.com/upload/files/molozikuvo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2476ec4eb---pifexurefutiribalo.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d948da9e20---31361831857.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tokmqee4o1u8mkja5q6rbmc5nr/32773334032.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b0e8e419---11850249373.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/71763013502.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070451fc917f---47563974377.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2606485b---25545383604.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794163283df---jalizoduwotuzaxamijej.pdf
    • http://bjjiffy.com/upload/moxiwoturiwolas.pdf
    • http://usateatop.com/_upload/files/lunerudepalexex.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe5a2b8f5---gewinoko.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91322a97f---27845499304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=print+blank+excel+sheet+with+gridlines
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
font_01_sfnt_off000106db.bin
544b00fd3f7815817d22d7a6cd7b7ea97cc0357040c0d6990370801ac52cb196
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10948 bytes
font_02_sfnt_off0001200b.bin
286923ea81caa8e64b3ed1c29782cda4b3f965e5fcddddb5110d19792110ff53
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16828 bytes