Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad8c4ff9c283b32…

MALICIOUS

PDF

81.8 KB Created: 2021-08-12 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83d662262ae78c1a4e0d0ad561ef3790 SHA-1: acf5bf2abc5254d6a28e31af421d98ff7ab21117 SHA-256: 9ad8c4ff9c283b325c462627fe9fc5e57182f863f2c4c30c72005f7a9887bd47
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fotojursa.cz/userfiles/file/xejugilujiberud.pdf In PDF document text
    • http://meta-min.com/files/59936090355.pdfIn PDF document text
    • http://rjt1.org/upload/files/gesevunubozalijigekevaze.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aacdc8bd89d---polusibupedoxoxij.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/67497537531.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870d36101f2---96688148807.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/fdd57f5485d575f7fbbdfab0001ac020/52161174569.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/73375616973.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4116625772798da966ada7ff11a7dd12/68955850860.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/87593031236.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/795261854ee480ee4d867c9c054c3c62/8812247595.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e2a04bdbe---jesazanowigome.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68d489755---movajugokog.pdfIn PDF document text
    • http://scro.ru/pic/file/65922282354.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/67403829006.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37b013d09---bazeferivuf.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nusedalojodiduvavudatus.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5988385d---16101124347.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.pdfIn PDF document text
    • https://htchninc.com/d/files/jevaxefamobutobe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c759580cb6ce09c4e426ea90f7d544af/75031081316.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cd6239ff19e5f114aec55e2c9723f939/8821966520.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/renukolusagisosiw.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41b59c6a986746cbfe8692a2fc93acc4/51145265334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=opryzelp+mod+tool+downloadPDF 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 10580 bytes
SHA-256: 041cd5448c7f6d72d31cc062822c562b0d3429b0d4070749b67a016e1d536f28
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16988 bytes
SHA-256: abb6de526bdb7257c10ddf432078f17c867e53734dd16ac6b0fcb11cf05d87e1

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