Malicious PDF — malware analysis report

Static analysis result for SHA-256 7547854de0178c86…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 11:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fed1389b290778852a69ae217a8d4409 SHA-1: 25dfa832417673bd022f04c8ab6c406fc7b900df SHA-256: 7547854de0178c8617e49d94f4d39d1fd1bf2689a931b0876fe0be26659cb28a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://quadocdao.vn/uploads/files/luxananabilowas.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1341a6a9b---19235648368.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d8510789---24919359207.pdfIn PDF document text
    • http://cwesp.biz/upload/file/11606095946.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/92476072696.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/duguxezokakax.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/31977534539.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/boxuweb.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081816321368.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/dofozerupasim.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/98415701907.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/zoparupemoxuze.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/jonusotasuraxu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9b901959---navipiginufefivoxivubo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ng0joirl8kiposla8kf1or2g03/43552432176.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a8e887cf201c28f208c0c7e62032d6c7/gebunuwebu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/12143948172.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/faxozavibo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb21e371dc1---84751354756.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/bepusefudamiperewizepo.pdfIn PDF document text
    • http://hainfelderteich.at/20810429815.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/vopoxuwoleg.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/xikuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=british+pharmacopoeia+latest+edition+pdfPDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 16640 bytes
SHA-256: cf1ae75ffc173a17e533920a5c36692e9c62ab0fc327c4b29bae89a60b0a6294
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10940 bytes
SHA-256: 4530207c682c84e6b82e624aba35b2b50f1521a18ec05c499bfb1294e36ea669

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