Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ccbbae62444b33…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 11:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee229f53480a24caf604fc9e6ce38257 SHA-1: 8b6a68f04c4842b464781bdf7d7d9731fd84935e SHA-256: d3ccbbae62444b335cd546241aeeb97f402ce9b97d31d2894389b72208e1cd1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=android+studio+text+editor PDF link annotation
    • http://apexnepaltravel.com/userfiles/file/zajinopejezanekebazegi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95409433299.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/81323554880.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/saboxitoletejadusudigoziz.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/sikajivegodog.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/zutetezegikerezame.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135a034dac62---suwokuzaritusela.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/52052252138.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sumibawuzobiwamov.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/dazotonejazurajusidun.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/rerununidigoba.pdfIn PDF document text
    • http://afslab.asia/upload/files/wupigoxovefix.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/38272827539.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/juzuwetir.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/20643654065.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9f3d8b79652cc11b3bb19f4036bac4ae/loguxu.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/8140381964.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aa661e5cc1b4663fcf9ce386bb4bd3af/57944043765.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/namotaketodarelokizawex.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/67329332360.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/5717360797.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/43675567191.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/fifevapexadozejivozuxapu.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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 18588 bytes
SHA-256: e1b100ac412e256dc6fab94575e12ceecc7fd049ec8672409794d98bfea3f30d
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10216 bytes
SHA-256: 6d952b89440162164eb82383b1d1fd9f64df51cd5c73999451e4b804067ca635