Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bb179d6b615b6…

MALICIOUS

PDF

83.9 KB Created: 2021-07-13 16:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e338d14c28df66270604b90a860c758f SHA-1: d97a7ef617023f89f8280639935cceed3d06a857 SHA-256: cd7bb179d6b615b63e108cb3b3d03a89cd7ea38d8cbfaeaa8d9e25459b4f446e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=erikson+in+the+classroom
    • http://gdbchurch.com/clients/43262/File/63294157449.pdf
    • http://adams-gold.ru/archive/image/file/marafuxuresusud.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd7f8c3fc---lovejaliwudubatutuxu.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18f014932674672968a1209e276f9f19/84247212773.pdf
    • https://autosaloncenter.com/uploads/file/kawitewasu.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0fc5e714---zenizeduzomukanibumuga.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a1d57497---2152494590.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62fa2808c7---zakipis.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5rkk7e51v8n873d5nhv6d0v996/54829231054.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e131a4a---gofeferufana.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8e4b9ff7a06c84efd224d2d7308e0122/88119725236.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd53043ba---80198862472.pdf
    • http://veterina-hrib.cz/user-uploads/files/galisawogerujivez.pdf
    • http://dominoliberec.eu/images/file/files/lemejoduziwowa.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b31b87529e1a9c28ab7c669e918f124c/tixatemisu.pdf
    • https://korovin.org/site/img_ufiles/73754770070.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ae50393a---birarivazekimasonoro.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3403a45b9---bibekibemuwalo.pdf
    • https://publicbridge.pl/userfiles/file/rajoboputafogidoxos.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lrdfb5p3a55s4amblmguvh6u06/rusozibowanowekizodimum.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/62521114284.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7780e21744---niraruwejanizimomu.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/sovizotizadilekasukunu.pdf
    • 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_off0000e438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 16792 bytes
font_01_sfnt_off0000fc4f.bin
9781052a6bf6224895eb5bb4aa33bd0a790d159211fbcee2ff008f484a53f1c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10572 bytes
font_02_sfnt_off00011436.bin
117b77997cd6506a6e6709bc3e6226087ca7f842a8625ae19915875c218fe5e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 18180 bytes