Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce3871f957f646f…

MALICIOUS

PDF

92.0 KB Created: 2021-09-01 18:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50d2793f9931440978f0bfb341ac6c96 SHA-1: 303f772a5b06ef1df344675f248a7b9ff7e1373f SHA-256: cce3871f957f646f95a6b802beed76daa2d869bb52914e8c36d6ad7cd257fbe5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://tecnicadovolante.com/images/file/kiwinoxiver.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cf9c1b431---68569879943.pdf
    • https://fsbulletsandbrass.com/userfiles/files/56573266743.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/97491829664.pdf
    • https://powermailer.in/userfiles/file/38265516463.pdf
    • http://ijdssymposium.eu/upload/zigikeguzup.pdf
    • http://vorne-sitzen.eu/pcms/content/file/rapide.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s2f2c3moc9dqjo8hmkqruep110/nawive.pdf
    • http://hzdsbg.com/uploadfile/1621704370.pdf
    • http://bippex.com/filespath/files/20210809025859.pdf
    • https://newsru.md/upload/userfiles/files/zatuwopoposexib.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/bipob.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/pipizuboropejixi.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa111b149d7---zomawikorosidubufe.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/84987166248.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43f23dce1---kebiwo.pdf
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/wowudaku.pdf
    • http://harasim.cz/uploaded/files/palaxirexadeku.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608076789b969---vetapegiletoxojamoguj.pdf
    • http://tuning-zone.eu/userfiles/file/dagumisudewasowosez.pdf
    • http://wohntraumgmbh.at/24246771218.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d65a6e728d9c8f510eafa65462ba3f0/18746013399.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611eda7a1c178---2413678379.pdf
    • http://birizgardenhotel.com/userfiles/file/nuzomobotevoz.pdf
    • http://systemsbiology.at/uploads/assets/file/tafigusifijava.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bakra+eid+greetings+pictures
    • https://mediaget.com/userfiles/files/diluvapidukawowolejori.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f953.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 16792 bytes
font_01_sfnt_off0001116a.bin
c9a15be7092f5c6757342a31bae6921f870a1ed8baa237e5c8d0594fe9ab4f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 10768 bytes
font_02_sfnt_off00012a29.bin
be244bbaceae73c5d8a2189ab40b1fa76ac6d4ccc7b4c870f57e3813aa12ee39
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 21036 bytes