Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fa2f0369c1db6d…

MALICIOUS

PDF

80.5 KB Created: 2021-08-26 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 613c740f1a4c39fc252caad95ff96ef2 SHA-1: 9a96a0fac9aaf88c89b3ef38df86dab3f36db1ee SHA-256: 12fa2f0369c1db6d02cc267ce6b660aa05c90d86bb41a45c60cf3989e1d4939b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hkha.com.hk/ckfinder/userfiles/files/38220569482.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161000d51d5ed2---texugumo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/91764534111.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a991545d4---97606871328.pdfIn PDF document text
    • http://webursitet.org/Files/file/25114348663.pdfIn PDF document text
    • https://argumentua.com/i/file/52541746680.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/99960519485.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/45569707852.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/sejukimofopologa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/71925041261.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/19ada0f753aac64b3449709ab3d6484d/27583457087.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/mepoz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759990d205e---tutabalojawa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9440549e---wegovaribarejifozate.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/51073651629.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/butadavejukujapuzaniru.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/42887206429.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a457fa1532e8385ac6c79dea975ebf28/vizaxosibapafutus.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/xenepu.pdfIn PDF document text
    • http://jsdarvin.com/files/bufebalomubos.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3be3a782---92148778314.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088011fcfc7a---nagokal.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d0dmifdgdcasjsslic95e9mpl2/89262062410.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/74028662900.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/dbe2b23c8ccb132af59f24718635c71c/wokuzipedelajimofimimewuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=4+letter+word+from+flarePDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 10216 bytes
SHA-256: 9565e7d4050a2ef20855919039d60b76eb9d4def510e8449e37e50b494a2df0c
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16992 bytes
SHA-256: 88fff69b9d8eda68b97ae9f9fd99160165c0ca9e9cfc5293092a156eaf7c9465
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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