Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f537cfe6d5ac26…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d007934597f37c4d72435dfebd16fd5e SHA-1: ff21da43cb46cebaf31748fc4a4eb9f69d386aae SHA-256: 92f537cfe6d5ac26a1e0be6a0883f5b803f975aa396e3d65fa6c06ee34b71cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and link farms pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=mobile+tracker+apk+pro PDF link annotation
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/26562369134.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/fubavujabu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0073872ba---8368064301.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/ruxavaga.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kakuritaduxini.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfc1226a089515d374bfca7668825376/3408852274.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/rapuwiteviwavu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/palodof.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/widufaviz.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/fimimakadekosesis.pdfIn PDF document text
    • https://tebra.si/userfiles/file/gubopes.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369c2b2181a---63772874892.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/tojosizigegelolos.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zebogaguvijoxe.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48641642542.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/68065615723.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/liwinevomuxosuzabo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/gakajezuvepezolete.pdfIn PDF document text
    • http://darec.sk/files/files/nifakiwasuf.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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10320 bytes
SHA-256: a3d5f02dd1b344be1a9beed821d1d4bac460199cd6e7d6c6f76e5eb1476bab68
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17648 bytes
SHA-256: 3ba98d3feaa97e627ff16b6a0357c3a76035472c64250ad9d460223871f21c6a