Malicious PDF — malware analysis report

Static analysis result for SHA-256 d251db5213bac73d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 16:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e7e15b0cd6351fb3e7e8a19bafdb4d4 SHA-1: fdd0c6b629a3e146f0d3a94e774d040ae2e79395 SHA-256: d251db5213bac73df6c3c9564b0899ebaba4741b9a0596ed6c4907cf0b6e0c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://hanlacsclub.com/ckupload/files/fesujetobolizakef.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d441d67d4---xigipaliwipa.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/lizerijexizelap.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xenen.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce61cefc0f---nunujawukutobo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/db0uen61js103pgdisr92m7tuo/92167971675.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/wamaweni.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qd66blhb04viilg5n0flh0or8l/fukawikegovujumejasenen.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zakenexadaxuxa.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/votogurawovixeduvekux.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/tumajadevajaf.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-11/20210811155853945886.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210629_210030.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/4085216592.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/26cp86k4hri61ndq6vfgtdisf7/14344363628.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073593d4e733---89229360747.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/zaxomodatufep.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/xivimaxegubuwara.pdfIn PDF document text
    • https://banghenails.com/upload/file/65126929795.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/86074691649.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607defa8d69cf---kevotoxuwaxilijabapib.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/70220524835.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8899295193---58493271672.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075261f314d7---30887403452.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vozewasewutugujarexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+loneliness+of+the+long+distance+runner+analysis+pdfPDF link annotation
    • 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 11076 bytes
SHA-256: 6d3fe56ec9907f84e1bd30f900338066b1d3926be7a1fa33525e4db85ceba15c
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 17940 bytes
SHA-256: bc402a2aa306ad223b4d87ab229e5fda21d42a89b99f94d965ca1705d1abd806

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