Malicious PDF — malware analysis report

Static analysis result for SHA-256 939f24d2b1d3ef89…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 00:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eb3e7275663529d566889adc7e85dd37 SHA-1: 228844ec4ebda9ec4319f634bfb7b4f776da7452 SHA-256: 939f24d2b1d3ef89c5efb66e14d7b90dd942b33a9388c81fdc46f2ce3e8e8303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to distribute further malware or phish users. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://queure.ru/uplcv?utm_term=kenny+powers+can+am PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jud4m9pgo5cjenfo1jgl7vskn6/raxibujidesuzoxuwad.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e265b6a4f0---16694450757.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/debedumugepimibe.pdfIn PDF document text
    • http://splogservice.ru/content/file/tefizosuremeleta.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cd5d4198c---96936507721.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/voknss1g4lduvicamjbjjb40b6/31063942100.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/46577330413.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22df0d5ef---potixak.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/wupasulagetanunezajew.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/40045833116.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/pifisawom.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/su8i2l6ha45unj7qtm3jssmm08/sitivejirupi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mjtr3mh2sogk960gijv3t3u4h2/92634784853.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/83e32a3e7164309b3e68f310b0cd55c7/jadatikojemaroxuw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e6eac84a---wamipalovarebu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/23007737560.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kivorefota.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6113cc64c4---72250364927.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/32af15543492318e2e0bf7475e699dfc/32670745058.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc977d80d---bamuzupowatuboveroxopiton.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/didakisiwuzuludored.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106162052139628765g3fnbtipp7s.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hvhd0be3uv4ck489uiltpq0sok/48303271520.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/satilupimonuponijes.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_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10492 bytes
SHA-256: ed8d4f250de865ee56604db1e0488fdb817c005dd62abdf035b776c249d7a8bb
font_01_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 17576 bytes
SHA-256: c66acb45e973dbc7eeeddbe6ada071a008650303ca97cd8f1a0b487d2927fdec
font_02_sfnt_off000158c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1