Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80d93812dda75a2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 15:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18f1c3d4118a768a6f0b0090a4962639 SHA-1: f4e9ae6b3897ba496bd03cca38a74ef5bba0229d SHA-256: c80d93812dda75a2dd90de83296de7746c3945868b7c70e1fecd6f6dcb191ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c513ecb76065c026b1dfdd2813954d1f/95483291048.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/lorexejofusetedajubiwa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c988d501a78---bifufawug.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/83674576416.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813fb2c303c---44622311792.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/9226861941.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mlh6oekqr0pd7r4vh2oqkca4l7/jowevuwefusorejogunikipa.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/64918702296.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zuruguxate.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/jilodujezasolusutil.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31567825596.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f89b0894---89804744615.pdfIn PDF document text
    • http://chikatere.com/Upload/files/36703230001.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugelude.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vpjqk0iu6m1trbnd1u1vhrtkc5/bikigefinasukofipaf.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60c48aac9---xapubesepimimogamuvubut.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/tejevudupomujaki.pdfIn PDF document text
    • http://regmac.net/userfiles/files/74454902728.pdfIn PDF document text
    • http://computerdoki.hu/user/file/gojuvitanavodaz.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/jutewivik.pdfIn PDF document text
    • https://sealskinz.ru/files/file/56071305989.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/jutadipajemukagutidikut.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/7405929345.pdfIn PDF document text
    • http://yanartextil.com/firma/files/92173948536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=5000+toman+to+usdPDF 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_off0000bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 18760 bytes
SHA-256: ac512b11d4d253718080e97294b4f6aaf3136094c056f0c0ec0341481bccfd6a
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10300 bytes
SHA-256: aae183ed7119243b3436f369a5daaf4414e30e90e07aa491189a01d9e7a1d024
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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