Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e14e091edc4f6f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bc569bf8876f716346bb133599b6228 SHA-1: 4e130747f8a33e6e1b30b4f484443db108014a9a SHA-256: 21e14e091edc4f6f7999c789a6d4ae2eb452d12cf43e8f0770890bf611d91064
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brod-plovdiv.com/images/meret.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb958291147---xepifo.pdf
    • http://peaceinsrilanka.lk/userfiles/file/fawusufujoxarizupizipef.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0cfbd53b3---sudibenavelir.pdf
    • http://asea-admin.com/_userfiles/file/20210525072526.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080507b68305---23756459588.pdf
    • https://warungmimpishio2.com/contents//files/30897455168.pdf
    • http://voxel-avocats.fr/uploads/file/85600893040.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d62591dab7682ef86657b83012cd22fc/vuvivaduresovoganik.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a729bad02c7f73af7075f458dd2fa341/pufibuxofodono.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nuvovuvujovakedinixunisi.pdf
    • https://techson-cctv.com/upload/file/35491722922.pdf
    • http://bassbasement.org/userfiles/file/40533490141.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13609743e9e1b0d2ecca5cab9b14112b/tesifaputatev.pdf
    • http://alliance-ltd.com/userfiles/mikisunu.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795deb18722---78956480613.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a6c84248c506c3bacd121f7ec0a80912/modevipix.pdf
    • http://wabasnb.com/files/fckeditor/file/83445485960abf0c201d62.pdf
    • http://ucity69.com/clients/861769/File/vugukawozewoxaxa.pdf
    • http://argol-editions.fr/userfiles/file/74477372653.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/rh0tqij8186l3jhgqpib6ijli2/dulanokuroruwizudiwexo.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bddb197653a77affeb2978011faa397d/59951286493.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5a4324c5---wosexefogefanokodar.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3cv5vq6qv05qs0v0s58ilk3c85/63349667478.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b709b4299---norekegodinu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+power+of+starting+something+stupid+pdf+download
    • 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_off0000f5da.bin
64e2600c7708b9f96e37d24ec5a1e6df0f7005ada31a581a120e72d3ef1e5b19
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 17556 bytes
font_01_sfnt_off00012362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 16792 bytes
font_02_sfnt_off00013b79.bin
34d631f0c8fa50ad49cf74104f50fb24b7690ba221275e0121f1cff6cb7763aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 11096 bytes