Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fbb2b131d6060a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 17:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33abc578fab470f88e449040df373a49 SHA-1: b24308ccb23329e305a5cc6a8aaccf22847850a2 SHA-256: 79fbb2b131d6060a2c199ebad7e4da47783f9ce7d237b96663bff10f47411324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the malicious intent of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=best+worksheets+for+kindergarten PDF link annotation
    • http://bettynblue.com/upload/fck_img/20210625/file/zifegup.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/lijorasizijamakuka.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16079031a628f5---87345292768.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082736c8f05e---89210200161.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/muvabubaxidezitidud.pdfIn PDF document text
    • http://hydrem.ru/images/file/75104145178.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fuzikujed.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/dd41944465ce6ff700bb6d9ba92f0513/46740492308.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/81649287770.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603ff777eb---69770991847.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/bivafagupulafoz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a38a24c2---rejabuwalaveb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607968a4e70bb---kanulunotifotevirunug.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/50394804998.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/xejigesud.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6t0kt5fce5fl4fj3fb00uvh8i/lisoxebabafovux.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g9rb728r89tn1ph79jbfghp1u2/kunifona.pdfIn PDF document text
    • http://enewind.com/pliki/file/68449932181.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/803f75ead2805fe7cd6b403a382c492b/44936289796.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/gijazejejejamat.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sunaxunemijatejasi.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/fupovovapowimazep.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/jesetisagazepebutexu.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 17500 bytes
SHA-256: b471678d6ae07918ecd80c8ef7258376dc2979b7718a13ca9d3d054ee1005c16
font_01_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 10816 bytes
SHA-256: 50fbff389370ecf7a34a80c6979e2e7a1e95261e32dd2f129c1e68419bbf5f15
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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