Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c8d90235ffbb64…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 11:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df11fdd8e4b7393320c9d530679daa69 SHA-1: a8d8e773a4aa75973f6025df68571e1e621da000 SHA-256: 85c8d90235ffbb64d83d87c78a22551b5c4887b6697a217200a77749f4aa5621
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=solutions+to+mathematical+statistics+with+applications+7th+edition PDF link annotation
    • http://orchid-daikanyama.com/userfiles/file/zapufipijijawusoguvaxiku.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a20e794119fe6a186f308a9e1d1934d/47403557500.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/tribhmtg1bd86nepv5uqdokruq/22007517109.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/muwoderupomi.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/sekenivupubovakilisolopaj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f23762f6---3111316946.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3bade12138d379a08effab6270eef861/80473212323.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd9ae7940---pixezejeruduxeditob.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d190ac5219---tawixituxawikobiti.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/670379d41f48370a56b170dc86908145/29575839771.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dmf3ltpr8dejkn4j4u464vq6bm/diwapokogivesazezagej.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dofetoliwodifoxegab.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/sizamun.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610145205082f---fifagovumenadavejopet.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210802_230208.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/podes.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/15808879221.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/tipexuvobogaf.pdfIn PDF document text
    • https://unosms.us/userfiles/file/15954545283.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/somemonabexazigopol.pdfIn PDF document text
    • http://shophouse.info/images/files/bufiwuwikivopirawoj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d854452af---83446154069.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10988 bytes
SHA-256: bffbf0610e4fc698372eb1b33c420341566ca6ebd3c2da155c8cefb0d782f20d
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 20868 bytes
SHA-256: 8e35bad382b150043e1d980d6273d066013de9c5d85b0d11f31d922d528692df

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