Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fc09e7b37b0cf9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 00:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 072b593b1809d4335f0938465d4dd87c SHA-1: 7870410283311591ecdfd77b1d6414439c402be4 SHA-256: 93fc09e7b37b0cf95b2de789f9e8cc41163a4aac005600de241f8d1b3a5e72c7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=how+to+save+only+1+page+of+a+pdf PDF link annotation
    • https://lazeo.nl/userfiles/file/12529148484.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/av688jhl1dadg2b7ff89us3s64/vesagetesi.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/22286440027.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tililit.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/84288578142.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/41160524145.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/xolidu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/37156140604.pdfIn PDF document text
    • https://lasanisports.com/files/98390811608.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455f52e1c06---suzutoxute.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/78365103388.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/96601127629.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/pegazor.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60785899196.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210915210424.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614060ad5d70d---voxomoziguxisej.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lojufaveg.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/30527866872.pdfIn PDF document text
    • http://silver1979.com/upload/file/vutaxivivelisazilafijuga.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/23633488073.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57a867068---84459268128.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/nafinutobalamopifokenij.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/65966126457.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/83764897971.pdfIn PDF document text
    • 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10792 bytes
SHA-256: bf1afaecd8e4f63d0d9152efc9aa4813ef662e5c4f94ca643f782567e7af575f
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17992 bytes
SHA-256: 676786478637c0c0e42215b75c4ab067419a786b958fbf9b4cc9c2dd1f1ab4f9
font_02_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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