Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efc0b2f1636515b…

MALICIOUS

PDF

154.0 KB Created: 2021-07-14 01:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 579030c6b84abd0d129ebed7576e4a30 SHA-1: 4e2b99f0d25f80be8f03acc92c16fa6d0a4030b5 SHA-256: 2efc0b2f1636515bfd0c080f104e02e0b442c02e9b3a50b5190a5b3bcc12a489
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 critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=most+widely+used+hydrocarbon+in+semi+solid+dosage+form PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/gu6gco53o3dfqg9b740csoa2r5/42770240405.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165a5c489d---14728904502.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/mikerukize.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9a7d4e9e16166abbfaae40e3bdd4d2/68455687313.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bogeworusujedekekokalup.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/80717226309.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/84649855171.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbbdcfd5a---32079832936.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/53132309938.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a545b18a3---puregipanujete.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/62701524943.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/dead922207cd7a66c6e7e65df1dbc434/8014980179.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/vuduga.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9o3c2vhedobmdl51jhea1aiotm/zofafitexeluzowegomo.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/37956820154.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/30704753313.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1usbjf0383s4hom6nucnkmbve6/xajewozevajinomelujejik.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/kusorefulow.pdfIn PDF document text
    • http://ubest.ru/images/file/80255630254.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/290b6dccde3ecea6856a4cec87fa09b3/35958142847.pdfIn PDF document text
    • https://airshow-bg.com/file/nukanumofevave.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a189ab39---51429916925.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be068a9fc10---pidizezetisudi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c5fb1e8a---monekagoridixasaresaj.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_off0001f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F667 18616 bytes
SHA-256: e15cae084395ce04885e23c7bdf59383600ffa746058628b00355a43662590de
font_01_sfnt_off00022724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F3B 11356 bytes
SHA-256: da31f84261a3cf89b39008449ff18eff72aea1f4cdf47f83c8909b39cb356375

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