Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac30fb4dc82ac453…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 01:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bfa4ca1865b1d4f02caf2ab3f3c200f SHA-1: 542657ccdfe4fc0900e45920a41a4a869b797083 SHA-256: ac30fb4dc82ac453b659e5b8a50ab0e4866bceb86d3d78e7e8e6a5e6dd687a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=bluetooth+headset+battery+percentage+apk PDF link annotation
    • https://gonguyenkhoi.vn/upload/files/94602694875.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/bojebokirom.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/80195825504.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/gamude.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109161522069497.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/tisokowegibegodanofelewu.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/serun.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905205043879.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fuzekabugamuwu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/45399872106.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xozituxobokopigidita.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1b72b00d---4088601208.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/gosenekabugajegowijajuwa.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/miwavijonidusebu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613195dbcc16c---41014260803.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/rimevagemese.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/sadosim.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339b8963220---nujobujuwawamopogova.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131e21d2ed41---29152385724.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/62204480431.pdfIn PDF document text
    • https://artenika.pl/fck/file/kirusixirereb.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/28711446364.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 17304 bytes
SHA-256: 89b6f0e499ce5fec4ac6ee7ea755471afe88e67f7f1520a6a542ae17d6db484a
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 11200 bytes
SHA-256: 37de1707c76b283417caadaa977bdc09c88f4d3479dca8ecc507a6439027eaa1

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