Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a520160aea2579…

MALICIOUS

PDF

86.5 KB Created: 2021-08-24 13:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4cb3ee5da63dd1931103e8a4ffefdfe SHA-1: b25830f35ae335bec8030874f875b0d0de398ecb SHA-256: 29a520160aea257963d112a08f2756ed166f3e28aff6d021b19b525ee9983b44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of embedded URLs indicate it is likely used as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=titian+style+of+painting PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0d6df691---39803712342.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021052813421621.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/munelune.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/49860506307.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/80d321a058b5ac2122f178850dc26f1e/44270845886.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/37458938483.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/43074588771.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04dea259b---fisamekekejejol.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fexaje.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f34b5d2f---butanibon.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5d1fb30b88da1dbe73f4ef494aab2bb4/45652618667.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/61998864079.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67838f1b3a---67833932591.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a033c841---lipezanid.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bec96ff---78555610594.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608327cf37221---82820738256.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/22409927732.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v70oplps4u3tggkb7pcncst796/lopirimusiverex.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/89018190712.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/mogak.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wedadokobuz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979bc1e4587---25176120527.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/21906055995.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/kaweropikakamo.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/684911705.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10508 bytes
SHA-256: bc489f72d1c6f991b697bb7ed50d204c09ad94c9f5d355b14765716d890922e4
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 17132 bytes
SHA-256: 67c8e87c2aeafc3d12fae18f866b7c67a3c9246785afef84d8b381fbb1589ce3

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