Malicious PDF — malware analysis report

Static analysis result for SHA-256 05eacf35a728d309…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 21:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cb83f317cff19d417ba742521a53fa4 SHA-1: c91399a18eb5c3e06d1040ab21b1762404e3eb69 SHA-256: 05eacf35a728d30912e63087536d871405aa5c6a08036949b0235911638d81de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=chromecast+mp4+from+android PDF link annotation
    • http://folientastaturen.pl/_data/file/xanizasuxufeka.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/wejukezogikesosalonaliful.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/nasuguriritasapivo.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/wazoten.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66c10bb2c---31603266045.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/nomiz.pdfIn PDF document text
    • http://jn-zhsc.com/upload/28073198395.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bevagatugub.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134403e9bcbe---46791187250.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/31488685566.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r9ib0km2gn9vut893rf1s4rjq7/pefazukapesudomiwurewu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f350d267---gasobizuwogiji.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/jusifojupovewetagugipote.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kikapajexaxewir.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/4691341021.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rerunajopasagidog.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vajelajufukefatureluvede.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/39182136450.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79443144873.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/11495612034.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/garakiwibusoboval.pdfIn PDF document text
    • https://aashianarealty.com/file/rojevevivotafabaru.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/lemologebi.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/ribamosa.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58184989311.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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10948 bytes
SHA-256: ad93561e3c9310262703a3cf3fe6e5dea01f3f242581f87d3ccb7bcc08c9e7a0
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 17860 bytes
SHA-256: 506d3710030138251b2a6d4d6a0d4d652bfd701ea95bf309f6b6306481864519

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