Malicious PDF — malware analysis report

Static analysis result for SHA-256 8872da6371e779ba…

MALICIOUS

PDF

105.4 KB Created: 2021-08-12 14:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a83627971487f271b16dba3fa803f978 SHA-1: 16aa1463084f86ce9401df3aa4addc80e736d399 SHA-256: 8872da6371e779ba89dca530bcc00b7a58fde23bf6d2c1faf2802988a78b5ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://nomylo.ru/uplcv?utm_term=canto+xii+purgatorio+pdf PDF link annotation
    • http://opusbiz.kr/data/editor/file/8362912160ee0540aa770.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6e8dce7d48971d9c680f911ccf747e9d/62515060439.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/lorojawemotod.pdfIn PDF document text
    • https://arendic.cl/files/69911040760.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/22887724343.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319c41d87d---baxukukako.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/51625688190.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/462766eced924de5b15f9a13f4fad144/mulomegoweroxu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d59ab45b2---10135038876.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/o7gbtl0e2j4gadt5i0jjto6eg0/25115932288.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/rawol.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24aac4026e---vojotanubureripuwake.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mibaxibuzozobolesezepofe.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ha73n2mbpcgc0ac3g29bslp004/53324884009.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/18968877755.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/79293735690.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/jumefiwufisixilup.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa89460404---goxowopatewidikuvitajep.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/69478832259.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/11642335586.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/tiwanuvulubevi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/71c80f5e7f39ec008b70250fac05b39a/nunemitawuj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/elehasans8vp0t6b0t28f3sc9i/81519876914.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/73407113420.pdfIn 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_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 18260 bytes
SHA-256: 5c86082d408effa68c997720e6e5dcbc65a3e5fc3e49dfe067e9a6d64bc7b888
font_01_sfnt_off00016eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAA 10560 bytes
SHA-256: f6efe6936ed26e95bedec67bb4b3e6e8f179fd8c6cfc205b125c4c3d8bce8031
font_02_sfnt_off000186ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1