Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8038c67360f9f0…

MALICIOUS

PDF

92.3 KB Created: 2021-08-19 09:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63f2bdde27d4184015039b56c0b98449 SHA-1: ef8aed56f1e0022e92e8026c34814fc8cd03fadc SHA-256: eb8038c67360f9f06bbcd7f9e58a97b6337d15329691a182ea24a9e5348ee1b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2ad43084144d6997a001ec178854ac62/74325672151.pdf In PDF document text
    • https://daaeportrett.no/upload/file/34063158212.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zunadikobe.pdfIn PDF document text
    • http://scro.ru/pic/file/rilix.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/612013582610fc67f69c08.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a76285859---74245829458.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/4307550803.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/26591694313.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ec7b3396---66769508949.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ce7078b8c1abc2bbdd81aa3aaebc1363/21768894535.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/088994e695c2d1a42b09927a7582fcd1/68845346120.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21457130b---lexugomukapoti.pdfIn PDF document text
    • http://humanlitech.com/files/files/4971331320.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/35e6e153858423b78e6eb9b7a18b0543/75982846848.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/milonugurinopaf.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wosakugotod.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe16c754---9594373866.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/11422038347.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082f044b609a---rulavelalejojonu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tri5spd4tg5kdpq9hmrodipe54/kerebivuzosatibakozegimon.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c5bb1c6e464.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jetovejapikutigomatiz.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/36c3048d71f031a35605375a3cc7ed03/89209773059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minitool+partition+wizard+pro+ultimate+11+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 8432 bytes
SHA-256: a4276e9617c1252abdfabf4b199497742e8ca4b599a655ce02e53b6490beac96
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 20380 bytes
SHA-256: 8e999ca5e1fa14c07d95796668043b7fc3e87788fbd49974c31c9c65f2eabddf
font_03_sfnt_off000148e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E0 10884 bytes
SHA-256: ad69502918b11b0508ec804241f6286de8b510930b5c7119d5e5fe6784463ae9

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