Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc83e2df7bf843e2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf19c2e7a540c65f083763c2ea24e7b0 SHA-1: 13fe50a5a7b5161daf5be579fc4d7b13318d006d SHA-256: bc83e2df7bf843e20e745fa33f6045e9261932bda5910ca6ee13dac68b85e597
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code, likely to facilitate redirection or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=interfacing+of+led+with+8051+microcontroller+pdf PDF link annotation
    • http://on-video.com/movies/movie_data/file/lobobezoverudimepokan.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/toa47m5b5a88p0b5dq32mhoh0f/zebifelotul.pdfIn PDF document text
    • http://vuason.vn/upload/files/5889499086.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/38559237070.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/mupobokupo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/semurijunujalifep.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c5b92ad6---9315982926.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/labuvugijanovok.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/dusafizu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/72879578181.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/jovibevi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de72dc0b3---31009086997.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa09b4c57---9257153645.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/folarufugazigisebaxef.pdfIn PDF document text
    • http://hak-al.com/resimler/files/43992154368.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/polikifeture.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f16cf0465---52551698587.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0647eade7---12386709624.pdfIn PDF document text
    • http://askort.pl/Upload/file/jizisowexezadekitedore.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/31217178706.pdfIn PDF document text
    • http://palami.by/images/file/49805043365.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16104dba587b2b---38689458348.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609867d374a35---xaworipel.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qq5nmvdedo26nkv06g0a4efvn5/nokago.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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 17096 bytes
SHA-256: 3484b47c89b7bb170a89518790865b912bf40d1c73d8fea819b6de83ef615009
font_02_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 11452 bytes
SHA-256: e648d6fa47e3c87b5f1a08115faa384811f4d4324d92aa4150782318f8a6041e