Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6575df3ee0ca65…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 06:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a9b26327332537d5a4549851b19ba89 SHA-1: 75d52e6c331257a4c6fc4a995ba34f85db8499a3 SHA-256: 5a6575df3ee0ca654d7551f57c5683c83a34abf85acdd6ffbe037f4985c2aff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://dd-inside.de/userfile/file/41193911906.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8f628710932896b77b179e9ac79e40df/44152111049.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jrds7vihjtduch6p1tfjuqcbt8/92399098798.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/13810887102.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/85a5d611bb929e37894c1ab62353972d/7269422692.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/68045428883.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/novoduzatuj.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xapagixukapomu.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/runupuvofoganixodavip.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/91514786987.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bfd67c3dd47b584f1fb7c31e01b0b9f5/jobakuroma.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/46831104686.pdfIn PDF document text
    • http://arablift.net/userfiles/file/jituropujisizubor.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5cc1d30e6---86752622280.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/nemibitupidobaguvi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kadifupaniruzojodijagof.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gosuzepixigesafawaxoromo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8651592---vovofuzefetufifep.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/37698389363.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d2440e879b816cb9f11c8cdef2510d48/61904688245.pdfIn PDF document text
    • http://imi.vc/upload/files/romidox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=preterito+indefinido+preterito+imperfecto+ejercicios+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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 20768 bytes
SHA-256: 4d57ec0cf5bd00d3e6cf9c8f44b12b01b3f0381cad36d6dab2b9717e2705d3d8
font_01_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 10704 bytes
SHA-256: 7def2243a1322a91d7bff328ee6fa2e56dfd603e9bb95afec8e350ff2ffcb415
font_02_sfnt_off00013b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1