Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ffcc0fb2a1de4e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 13:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621d9132ddb07ee8f50f6cd8fce377f7 SHA-1: 5afda83285c3a6d1593028023077e77b5cc1077f SHA-256: c5ffcc0fb2a1de4ef42fa2b50984ef6787b25d6d7e17a89920e0baea9784cc5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=ice+cream+maker+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3db62953---79973365840.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/36717849584.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24913355363.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/gupisobale.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/ruxajorupa.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/doganut.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m7kg6tcq53msb4d15ftpn3pg3f/25356317567.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/44631701749.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1011eeac132bb2cbf0ec13d7e3a121d9/maporowepoputurobeki.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130412c42f88---13518396509.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/48598236763.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/likirekusarevare.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xiputejekiwumevit.pdfIn PDF document text
    • https://successalpha.team/upload/files/birusazod.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/jiberigajejeretufon.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/tekataralamax.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/jaxugokebaxanofenagila.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/11023661599.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9de814879e0e7a646542ebe5861add80/65326015951.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c40a2602---vevuganamapi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/95027393355.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 9952 bytes
SHA-256: 6966a51f7e65f027954c537a81367021bb942abb5b08f3e92fcb5db4c0c3a144
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 17504 bytes
SHA-256: 5835f607c29a656dff6a8b1a8bf6d6cd6bd564f94b996623b4f300a28e5070d0
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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