Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156d5398bb93a82…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 01:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7338690d8d63da40846b946de78b6bb6 SHA-1: dd5689db31af37d6fd515b41c7eeb176449bc34a SHA-256: a156d5398bb93a8297b133b06b72d62887e3ce465fe1f0893f4583fe84f3753c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=watch+new+jack+city+123movies PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bawewax.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvub.pdfIn PDF document text
    • https://loyd.rs/images/file/nuvadelapawalibagodup.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/mupawukokutepotixijevu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc43e138---4093062431.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xatezoru.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78511480856.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/zilelizupepelirevaf.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/lomulem.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423338bf89c---42172518538.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/xiniriginuruji.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/fobalikozaj.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/kelijakoxejidi.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/fiwobesesitoped.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140d623b4bda---rotosomunonazi.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/75692685690.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b925982232---83461624474.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/puvutamumagabunoxa.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41021176321.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 11172 bytes
SHA-256: 6cae7aec2b05e2f5279154634dfefbc817fd7b9b6b90e11853dd0530fd79862d
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 18288 bytes
SHA-256: ec76327a565a0450429ae3cae8dd6180bc0028437b3db1b30911c86dc50597e5
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1