Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd73eb0fe84f80c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93c873d5b0db93728fd3c7b05b61361f SHA-1: bb26148e76e6da76beb259be9e32ef99e4da39b0 SHA-256: 7bd73eb0fe84f80c2a4c1856f497f88d2d2d469a8fbd1b9c1cce0af3b3f78008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The primary function appears to be redirecting users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e48df338d---22174504405.pdf In PDF document text
    • http://vektorma.ru/uploads/assets/file/sevuneleguporinuwevaret.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/52412075067.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b9e4a72bc---jitujupewivurukizenibisib.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/5153532548.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf0ad560f6---jowezoj.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c30ab212---41881972080.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/woluvukikoginozuzuve.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10747282858.pdfIn PDF document text
    • http://alkanboya.com/files/file///todotogumilimuzidaveb.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/86370133647.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/apb693pt7vc59c4cjohbfvru81/56154508329.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/54901752850.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/79343860188.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/38811989588.pdfIn PDF document text
    • http://kbchina.de/upload/vurosadato.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f70f879e52---14793268062.pdfIn PDF document text
    • https://aspirans.com/files/file/83615705244.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052102063412.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/94538052780.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bab767f2ee5dda739b62edf0fb03a604/12046467090.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xogipomofikuginekugeb.pdfIn PDF document text
    • https://mojer.bg/files/83014256272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=osha+standards+book+pdfPDF 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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10580 bytes
SHA-256: 106b7b7ee1f51d5866de4543ec3c2b495d57084da4e7f471e947134d492c43f3
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 15884 bytes
SHA-256: b8addc33df77fb1ff3aadc8de79fbc45702259b417a9c23123d8d46b4cfa4e15
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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