Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68f797a67f760db…

MALICIOUS

PDF

85.4 KB Created: 2021-08-10 03:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b50aeae03883511507162b76fa6cfb7 SHA-1: 34a62f2942fe6267d4274e7fc15986157e0b9ffa SHA-256: c68f797a67f760dbc2cb281b9a6d64f223593290a7bf782ac8a49314527789c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or exploiting vulnerabilities through the linked content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

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://www.nhabe.com.vn/ckfinder/userfiles/files/zigipatufewemoz.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/finalaxujepofajekozitu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/89885058132.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kagav.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/77530547892.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7dbe9a67112d131119a26450596fab3f/23199177992.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/zulomezakezitezigun.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bv0i72o4g9665oic4iogq6jcc6/vozoze.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/faxobuku.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6387c5ebb28d9bab1ab23ec34986cf2d/zolagivisepatuju.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kadozogalonotu.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/wibikarovidukob.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/sevifezuniba.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210620_E0355AB858E4E94F.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b0b9b9e00d09049e4646290b914390fd/21109526970.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/33246926361.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/surower.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/29d23f04cb9b003fad1813b9a50393ec/gofabinugexasunurejowulud.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f4868ab6---2148717113.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f605c7c7477f161d5c45ad28415c1417/kadilo.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/piwutotikoxu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/35187368440.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/12596271356.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0005bd407598977f6b6931ccb6629b74/mefapoxaturizuvefunat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=actividades+para+tercer+grado+de+primaria+matematicas+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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 18700 bytes
SHA-256: 1cd36668559e31f08e2870816d769d165f3eb5ff06d1d387a3c616c137e8c6fe
font_01_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 10860 bytes
SHA-256: d613fa2bd18e60b115a1cb12b7655bf40a2ecbd09a044d57d920834af9a3ec79

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