Malicious PDF — malware analysis report

Static analysis result for SHA-256 5275f735d1a69bf8…

MALICIOUS

PDF

90.8 KB Created: 2021-08-06 17:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 682032684bfeb25662c03418d91587b0 SHA-1: 730dab883375888914f931a13b989963a0ee59ce SHA-256: 5275f735d1a69bf811b4eeef04abecf00fe76e0b7c2e41e3dccf0aed443fbce2
216 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically designed to harvest credentials or abuse multi-factor authentication. The presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggests an attempt to redirect users to malicious landing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or a callback scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=how+to+get+a+fake+visa+card+number+and+security+code PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab24ae4d50---xuxubaxazipotapig.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/sogevavutipatizivupisiv.pdfIn PDF document text
    • http://foodchemsino.com/d/files/mirikiko.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/55461796045.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13b8c4efa---76730740711.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40055506826.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609458b43c8d1---64549089470.pdfIn PDF document text
    • http://eminencesolutions.in/resources/userfiles/file/88974050111.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g5sq3k3k10l5nljv2mkbnq8juu/66955536292.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1b3e0dcc18dd32c2e745c3b5f036fe07/10251716077.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8251527a66054b7a2431a5c84ab73942/zituzanazujenod.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a8b750abe12c940607becdddb279c1ee/76318005872.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e42dbafd3---girizepifesanidejom.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/46343960941.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/abne96t4tl7iefmq1hq7nip9s5/vabisarezut.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a900c984de---vogutikabukugeru.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d84ca37c6---kuroxuvupodo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4f68173---66356446873.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/demebaxibi.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/pinaxokevanoxosakuder.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/18341547982.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f6df8a127d9e9ce2ced63782d5f391aa/mafabetuguwafobov.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/ponigezaw.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26455040260.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_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 16932 bytes
SHA-256: db827a791a6ad7ece042ce10d897fe54986ceb77fd3d7b0e0d202c326d34c19f
font_01_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 11364 bytes
SHA-256: f22820215a773b4a7b46e732c663a36ca14cee966dad9df66e7e4cec7693f158
font_02_sfnt_off00014427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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