Malicious PDF — malware analysis report

Static analysis result for SHA-256 085ce2887565bbb1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 11:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f63d23a5334ea736310774c1ec31bb4 SHA-1: d9fd3bb9778124df8a15ce706499db72fe8ccbcc SHA-256: 085ce2887565bbb105dcff13731cdb814fb0be81b88b27ccf21993d9c2f8fa86
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sochi-riba.ru/ckfinder/userfiles/files/bazarofezivuluguxoko.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/13542369615.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18a31d7bc---tusakonopejapa.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/93416294311.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xesexajudojipupeg.pdfIn PDF document text
    • http://zubrcup.by/files/files/vapoduroxetipubeni.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143962e491c0---87203291069.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/52619408352.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/samobelakevetadi.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kemuragis.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/nidivovitumufitaforomi.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/94205129192.pdfIn PDF document text
    • http://blgjad.com/upload/files/35189431311.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/24451559632.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/febewusisupewe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5dd5e925---76773225223.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/mokowanez.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/duketagapeva.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/nezikevaneriromodanadan.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xadodudivazivefeduboke.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/86072819146.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/39032881087.pdfIn PDF document text
    • http://hopkim.vn/upload/files/99537500550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+sopranos+season+1+123moviesPDF link annotation
    • 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 10744 bytes
SHA-256: 649fbef3bf304b0b78ef696b22ef4c8a31b023fb81ba106cb772b04281ca70d4
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 15560 bytes
SHA-256: 459c75b19c125459e237af504a9f09cea192f1cb8ad318c6b8163c3022b96254