Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54e6bedc59fd895…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d55be0dc331d3879a057178c0f09243 SHA-1: 98be78404fd4946be01d5a956ea5583afc9ca183 SHA-256: e54e6bedc59fd895e112e518d025d6e0281e57fb78c77370c96c49eb08eabf1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a dropper or phishing portal.

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://garglob.ru/uplcv?utm_term=nba+2k16+mobile+apk PDF link annotation
    • https://rajatotogroup4.com/contents/files/66374460981.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161335e52bc390---59992309428.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fikojurak.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec75016d7---36129046543.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658a94917a---14301140336.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132036986103---guvupopawotuvo.pdfIn PDF document text
    • http://acelybio.com/upload/files/kobumuja.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/somadu.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/mugewedez.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/65143880248.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/vesisep.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dibiberujogepumo.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911101320648553.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/kenavekajalizabedud.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/raboviviloteposekomevu.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/91062096521.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/51892816217.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/kudufoxefoja.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/3469994388.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/26462217062.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/59887158251.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/12316630436.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/bujexuvo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614255abbbc9b---pumidabedawoniponim.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70304703483.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 17852 bytes
SHA-256: 7a59addf1aff21123e1dace03f9adf88fd7dcfad5a5737077c88e1555f53ff4a
font_01_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 10492 bytes
SHA-256: 17f76950269ded4cc2b2bbc300c2451643990912b0b12b4d29217acf7908521a
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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