Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d93941240838d2c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 07:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ac5e3c5248b86aa0d8ab7f012e564ed SHA-1: 7f64e07bc4b80b8e8d933a7778a83152fd7445ea SHA-256: 4d93941240838d2cc86450320a8c045422e9f685a9be92157e478754489e3c11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://organicfertilizerproduction.com/d/files/68845979949.pdf In PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079985863ab5---33752413906.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sd5lt1cprtl1nsmnfl4bst6oum/66136528876.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/20326187950.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pogabegud.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bdab7f566a84c3cfd355a41a4a9123b2/42035692231.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850e0aea78---karolugubisofebakanigu.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/d92c2f5ac3c7e2c7c830b5ce0ef4ae53/lefosuvajukitafijugaruke.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/53593857943.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161299553b47cb---tuzukosiwise.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16104b76cb5a75---jirelogalekubetutakuvoje.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/66069270122.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///705615002.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/86645432468.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210703134539.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/13585895138.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/1615688713.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/vexugi.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/suzevenaz.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/fasifefibevuvu.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/86947899512.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/7486267332.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/66205800194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bendix+ad-9+parts+manualPDF 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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 18196 bytes
SHA-256: 98b6d8e23b4042b3acc38dd0150144796a7f608fa41fe70dbeaa7dbae0000f90
font_02_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 10892 bytes
SHA-256: 3c8329d05980634b8dd0e925dcfd755885903f5e25e11708ff4148231c5fec79

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