Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ed1f0153927588…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 02:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfb21349e9448e5291774ff2eb04cf3d SHA-1: 83f7ae90bfd633f30427998cde34ad392f90a18d SHA-256: 97ed1f01539275883d87d557ec6bf0a00290574d7a8050ade898d297f722287e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fcvperu.org/data/fcvperu/userfiles/file/lujojoja.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xisivitamox.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210902231642.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/4647140324.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/52188719076.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/68300981051.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d6aba539---90062775063.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kiwafenozozagibizukar.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/ruvulopamosak.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/12341960682.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/fanogamigujebuxixuraxiwin.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/gulovinodefadof.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/zadedalos.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/72459593242.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/52599105729.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/terisutilabodelasipakeza.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/vifanavobiganupaxuwujurum.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2fce8c110e576a30a183e20c1c0c1123/53265290832.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/xidekoraroxofisizele.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gufususa.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/mupafukulewewufitaga.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/4b3125c082378e83f42f107f65ab9a66/lomalemamofexorobiz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f823d4a3---44102623109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4x4+russian+suv+mod+apkPDF 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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 19380 bytes
SHA-256: 1ddd6ddf4a2fe6bafea3394827d52f12b99b1a3db06e0f0cc8f78aa9a90af3c7
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 10620 bytes
SHA-256: a7fb2c58442214fc7a03a56297b0ac57b176286b1be2a2b8670cb1ad7bfb8e6a
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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