Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0eafc7bbcb45df…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2444bc7e2a656c556e710d58b7c20245 SHA-1: afacc347e2575dfb4f9a1bb44183b1ca781d10d4 SHA-256: fc0eafc7bbcb45dfd32df1d0e99fb1165d53a91c6b23714723b28f4c4d44ab53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier strongly flagged it as malicious, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, but the heuristics suggest the primary goal is to trick the user into running commands, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ahkjt.com/upfile/file/55299557593.pdf In PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/13981692248.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/45207458506.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/5794650159.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/77367915157.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b98ae53c---97563544798.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/34916105753.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/3615099103.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/lekanalabixexavovu.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/foful.pdfIn PDF document text
    • https://simorgh.it/uploads/file/20311011382.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/bibusoguxepu.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/xukagutidulijuzasonubu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kanadoril.pdfIn PDF document text
    • http://airfa.it/userfiles/file/bibuzaxalimazasi.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vifuxaroxusepenawolekolem.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6822969bbfc874489cb9de59b1e860ac/zuwulorivawapufazu.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/15888082539.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizofavinejowejoruremu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8d6f484749deb0e305b8c8d4a4677b69/95015531642.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/41100727921.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/81465989407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=game+dijiye+game+game+dijiyePDF 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10236 bytes
SHA-256: aa2337883d071557da9914b0e94c9536c9536b08a7b9ce7a34bc366d3780d8ba
font_02_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 16268 bytes
SHA-256: a87c4235cb032529f7299ee0df49f7da256da78d2e56663005b4748d08f97faf

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