Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc96dd0040f3b1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 02:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1a595c395fa4c5d484dbafc1d6ad0b1 SHA-1: 320c8fc54a612852efdb052a2a2593b034270e1d SHA-256: a9cc96dd0040f3b11c80f1d356618adc5d5e609e541d20361d468f898f154f07
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://semagro-msw.ru/pics/images/file/jifopojawerozof.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62aab7552---49203974201.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c1358b14---lugovopuw.pdfIn PDF document text
    • http://master-br.ru/img/file/59552824527.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/gigekevagivup.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa174ca3254---47417373895.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/cilfhn1eijgo1k29u0jfbejniv/36580349847.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f73b33215c4---kutalumaloxarunalemaf.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fisujawanipetuzavitazurux.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/95344521271.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/354e4fe61dbdf7194aca3ca7b31a129e/70503867198.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dffc4e943f1165db280ccbb5693267c7/84166165901.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db4e94a31---bitikimanew.pdfIn PDF document text
    • http://domplus.su/userfiles/files/22284100120.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1ef61b8b---kinigadomegotevoviwaga.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3033e1251---godivamunabute.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2bcf758ad0e919e86fda407cfb40d959/dazalawudokixute.pdfIn PDF document text
    • https://tpk-m.ru/files/file/wiredanowobewomezi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/52f75b730f885ba2b0d52d2b1a577107/51221279937.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/xamelofevamawipukixir.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zokegurumuberajime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=queen+elizabeth+and+prince+philip+relatedPDF 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_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10680 bytes
SHA-256: a4c401f1d60f9a5545e2f7de66f782dd2a25d288a8c650fc4a04e65d54306b75
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 17588 bytes
SHA-256: 16ec43194175732bdc55c26776cf6df0f122aebfd89023438f3cb67960162316

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