Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65c1938bfe458f2…

MALICIOUS

PDF

80.6 KB Created: 2021-08-08 22:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53484e64c768f3ec47f112aafd680c40 SHA-1: 39276ca824b79ef909a78104913f028f625bc30a SHA-256: f65c1938bfe458f2bd83d387f9de902d1bf5b8a634274845557267fa3cc1446a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external domains, many of which are hosted on disposable or potentially compromised infrastructure, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://pphjako.pl/userfiles/file/90520305233.pdf In PDF document text
    • http://aite-materials.com/upfiles/file/bitumepekus.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/58785312435.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pawolifej.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/87703802566.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/70602789478.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/53208381896.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/47266939263.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9b96a1f2a382584cf491e3755575466e/75266870167.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/67068397420.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vigowesiwozalis.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d570549fc3b---91826276102.pdfIn PDF document text
    • http://short-story.ru/upload/file/kemofetajobovite.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51acbcaeb6dcb16492aaddfd71156f3b/xiloni.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4fdd2622---39111912792.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8cf28a809377e31d4bcd95eb53a746ef/21154794885.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/pawevirasaguwenowezigika.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/11591735240.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595ded2ddf---84302925957.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609729c8e0375---wavag.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3f8e1860e716ff4f131a421a109a9a9/lumorajeseletej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=que+es+un+acto+de+habla+perlocutivoPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 10976 bytes
SHA-256: 8da68d57f9a59756172fad654af19d7014c2f896c8b4fad2f02b8a07afab616b
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 17804 bytes
SHA-256: d16c90c66d50ac6403a3a9a1d028ba09f8a1b77e1caf9681ce7b092a47e999ea
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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