Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6faa524f74831be…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 07:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f3a20c586b7aac7e578905bbe087b0c SHA-1: a76c3e95ff866fde93c4f76eec8d33ab3dc268a3 SHA-256: c6faa524f74831be15b877c8b5e327c58328a73d41d1d380b15d517f36c62d8a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gaziemirkentkonseyi.com/upload/files/sevivubafifezugowanepexu.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c4d78b6f2---vamaxu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/romirasemevivezabazepiw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/feb5cbaa1d4a61526d9b142345e1b8f5/saviwisamatixinuti.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210921182505.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/zovikadu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/13801162990.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/13955642502.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/92812812504.pdfIn PDF document text
    • https://istanajp.net/contents/files/gunomof.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/81760686293.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909070651.pdfIn PDF document text
    • https://ghnservizi.com/file/85417255394.pdfIn PDF document text
    • http://jarosi.hu/files/file/tazapibutadiwubavup.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/56045242274.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kisel.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zegipez.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/10667891658.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/37348350447.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///500155711.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/bixojodomiwuxekovoxopisav.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615e6a34124b5---22694486890.pdfIn PDF document text
    • https://securitydm.com/slicice/file/59764133267.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/10836540228.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chicken+bolognese+pastaPDF 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 17992 bytes
SHA-256: a95644f4217e924bf0ebc4ec34cdfab396228b51b310e7c399603ea51da5d360
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10816 bytes
SHA-256: 833ba06e74e199d3eeee3d1434db36c7ac51a0d8da4294ca2c92f0469370a443

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