Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1dee84559a79bd…

MALICIOUS

PDF

81.3 KB Created: 2021-08-30 03:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e006d21a0f274a00f9e076a687659e6 SHA-1: 3aa87cffc1ebd4eaf4ecaf64fdbdc65d41ed0b75 SHA-256: 3f1dee84559a79bd9151bb1fe30d5871d4bad5a115798eb47e39c6b5535926bb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/25273afc51fd174708b27ae5b5486763/97281310994.pdf In PDF document text
    • https://aneri12.cz/res/file/34011231315.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609acffd81138---lesoki.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/53240621549.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/faa30e9510e3307d94e24d583b2a90b2/pelimewarugunegawegawa.pdfIn PDF document text
    • http://turatabor.hu/media/81353926463.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kilekobusam.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/42n49j4hnltg6alfoad6hdhjrv/3559871434.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/pokonadavamu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c27f1224---bovodumiser.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9pqvdosi0usp5e13jccmvb9jre/mujutovejeg.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/nerilevesasisif.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fiv6ac165u0m95ecvh1286ege/soxirige.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202172173373956.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/diwokenebuxezuxoz.pdfIn PDF document text
    • https://steammining.com/userfiles/file/xijiwo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ef5f04d8---visalefitoto.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/33818039506.pdfIn PDF document text
    • https://melz-feu.ru/upload/xogutizunupoxa.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/sojunetigex.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/88656039708.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/29233384069.pdfIn PDF document text
    • http://freewest.at/86453706134.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/xilusapenavepepok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=1.2+liter+to+cupsPDF 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 10340 bytes
SHA-256: f4a5f8c499690bf6e62a9591eb9205638d76c34f42e210fcad7b4d7fd9405cbd
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 18252 bytes
SHA-256: 3e7e20a384cfc6358f66b9e0019d2b8d7476db7505c37b64b8834816817c6356
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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