Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c74f392c26b10b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-27 22:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6d3ec25c3521cb977e9b9cab609ce218 SHA-1: ad448484487ca426d4a387c03e35459393bc27c2 SHA-256: 73c74f392c26b10b63b1b68a8e75ffdf860521b751fe30395212cfc49367e58f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential harvesting lure. It presents a prompt consistent with MFA or one-time code verification, aiming to trick users into submitting sensitive information. The document also contains numerous links, many pointing to compromised CMS upload storage, suggesting a distribution mechanism involving link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://interface-referencement.com/userfiles/file/bajevutalo.pdf In PDF document text
    • http://deauville.ru/files/file/monemegiku.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xufozalefowugenowezeja.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d51f09cf---27083477162.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/419f9710baf1832d049875c9e2b75590/52193119866.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/856a7af9098ffd9f0d60cc2cb7dde443/rawikosonagodorudugen.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/45815442987.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4eca97b2---10924799578.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/50619233280.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/53244676983.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/guxevozazawakovo.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/69224233364.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ac66409c---16613025381.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/27791744388.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/40044081693.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sopoguzavilixavudonusuzav.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62b389e33b---ramarev.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hrt758a4ua3sql76mlvcv2k7nq/guduxoxasudiwufutawaso.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa49ab4aa7---negivatidujogelalub.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9adac8831f---jatepito.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/59106912009.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/553429f037ec190d9dbe4a8c0c79417c/301617439.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/64016760662.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/9844763030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=are+they+going+to+make+a+4th+maze+runnerPDF 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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10768 bytes
SHA-256: bc0989b1b405aa98951a91dbc2ce9b140a6067bfae8aa034161b139405bf2aff
font_02_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 17700 bytes
SHA-256: 573fa5ca6b4ea1f124b4552d840d9897a52547a83da01a541782e4b9eac69b6c

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