Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5031a7ed5918b5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-04 02:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 83a4864a1a06d19130bcef7a4dc05c9a SHA-1: 271056cc843002ef19c5c676cd5654841f50fd50 SHA-256: 7b5031a7ed5918b5570be6ccfbbc2ab6d94bf4665d14096282e8d93687d120be
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of threat. It contains numerous links to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The presence of a visual download button lure further supports the malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d842e564ed784645133080cc4ac3f34/pepiwuwunokejozaluxefamu.pdf In PDF document text
    • http://it-hair.com/userfiles/61922140504.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/28116374118.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a720d4c3---senubemobagizetunoveri.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2f0e9ae5c6864227be95d2512bbd10fc/kajiloxedokedifoba.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1e7e809061b705a4144fc228c8300682/76681571575.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/o9lguupopkm79u7mnofvoanl4d/29072044754.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/luputezupujipupuwumises.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f6ac08beddfcbd8a222c7e7dafdf53f6/57332200615.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d44deb1bf81c0d726bef05386bb7358d/86634596701.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0dc54307b7c9ca000204a5d382d4a32c/57155491627.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210607152508_ubfa7b.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd53860d8---53490840319.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xavosunedamuboretasonu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079b972e07b0---dizezubenetivubunor.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/44924990563.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160842d8165172---31866305148.pdfIn PDF document text
    • https://nadamasristorante.it/file/68801314200.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/31587585966.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vedifexenuk.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/18824178545.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aade79a52f---19861376558.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a0745491---35217435342.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/6928036943.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9f36f83da63e2430310689768db9ee5a/xuxulemup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=class+8+science+assignment+answer+5th+weekPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 17584 bytes
SHA-256: 91b0cf16a582f8cea93390a59b27b6f4b2d584a3a528a185212f438b3574b6d1
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 11108 bytes
SHA-256: 59b47d687f1241eb8f859ec94538f46e9322f04c0632a7be99a4198ef5fe9a13
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082

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