Malicious PDF — malware analysis report

Static analysis result for SHA-256 748744dc4fa88a54…

MALICIOUS

PDF

82.6 KB Created: 2021-07-29 22:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38a86ebd574c7c5172aeb7836574b30a SHA-1: 61f0442fd3e6df37759b5e3400e388cb6e232659 SHA-256: 748744dc4fa88a54b550d1281b276d9c85860e5e853cf34a2c10bd43181f3575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing attempt. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=facebook+login+account+password+change PDF link annotation
    • http://tranhdaquydep.vn/upload/files/17873232030.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/gufidi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rinozexo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609be12c9026b---78517761596.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8b2c50e4b56ca356fcb1b9965308a47f/48969205177.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/46384064598.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212af5b43b---melutufogutifa.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2b8101c324b33a6346b211f5a46bc92a/nanexaduratomidokej.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/blobtft0fb8ong84c9diudo155/junopokijopifobe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/guguz.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/zisusopevevanakitewikozi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7d9dfa53688ac22bb6110631b9460185/8091581750.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dukifedero.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/7630963132.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac9a47e9d---damevuzagixa.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/acc635e72deaf79a7a89f7b2d0cf018e/wudota.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/5897338210.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c522ed0321---7868662034.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/16762108629.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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 11188 bytes
SHA-256: 6e7e977d162d272ae7587b7f478d3932b0d132cd7e210b960a98246c517e17f8
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 16924 bytes
SHA-256: c7bcce18580b0d8c072cba986a7af1371e14ffb9b081b2721138ee266f3e0d94