Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed77e16cfe243c…

MALICIOUS

PDF

91.3 KB Created: 2021-10-09 05:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c2d6898a452b4399643c24be7c72b5fd SHA-1: e9033cb97d488bfddd18f4c9d708ec86b3f064dd SHA-256: c8ed77e16cfe243c34d69eaf04f443b15217f48da7ad1c9f2ced6b6b11106290
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress upload storage. The presence of numerous external URIs and the classification as a phishing trojan strongly suggest the document is designed to lead users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+to+get+my+cat+to+walk+on+a+leash PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403496af364---95133189679.pdfIn PDF document text
    • http://saint-party.com/media/file/69754049411.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/89976922573.pdfIn PDF document text
    • https://ghnservizi.com/file/75936934919.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/54370681694.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/79511229469.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/suwemabopipufixoxoba.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/94404267637.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16160c28a9c649---12169299913.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/17797039293.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/24101202291.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/90380619121.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xowazixetopudojuxulepupuj.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/mabofakomibujiv.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gewipovimara.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/13054223399.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/losevonimidudofenadez.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b46ec17d8---67352585126.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/xakejuzapokimu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f47b428b7aac93c3bc18c208f5d2fc08/51906643954.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mobisoxulav.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/39798794572.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/47051114837.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e753f8c45a---xonuwetirisewigukawosuji.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/16076473109.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_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10768 bytes
SHA-256: 2be70b31662bb89639a239367fa648f570dfc1c987953bb509dafb37dd3bf8b7
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 18976 bytes
SHA-256: 88c90dfa3a917dcc09825704da1297ce1153119c0b8b82fa490983995ffc18ed
font_02_sfnt_off000146cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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