Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6edee8b7cd7eb4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 04:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b3e6a7d28c4364a4e7b00f316056576 SHA-1: 9124b49dd42353073604a7c1bb073b63ef241077 SHA-256: ab6edee8b7cd7eb494ce186ffa8c3beb179af92d7db3ebf6716ed42bacc2c415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign aiming to redirect users to malicious 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 http://automotiveenergy.cz/userfiles/file/jizidurudevozipifoxakuse.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/dovugelefufuvodidononu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/fedinixorixufumotamif.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/39869809769.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/3593188416.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jatesejojid.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021060104544753.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118343c0bafa---53704790908.pdfIn PDF document text
    • http://toonesk.com/upload/vowukotinawobupote.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kn9jqspu2mcmpeoqna6jghq0e7/temazaralereditinuzafu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210625_B8251318B1A82A7F.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49a3053b2---36259747010.pdfIn PDF document text
    • http://bociany.sk/media/file/tumepopipinafezeduvemiru.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/58670646252.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ec4e673d---80408042059.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/35290620712.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70644792984.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/gazemedemunewowezisiwun.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jebujejosijatanojokukurun.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/18752969698.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mupiwonapokusunenel.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/305534474.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/13483701659.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/33016dfa2177159f1d755a359c23612b/nedabodagibajuki.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/pakutenotasobulejum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=histopathological+examination+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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 19348 bytes
SHA-256: 0deea8f27ad8f710d5e9312baa87fc48c4387338d3a4d547f90f2e3ff7404a31
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 11060 bytes
SHA-256: b6b806fc117f41e767d206d9cc599516bd1fe8251e6cf6d94a35270d027ad7e1

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