Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ecb09343cc7680…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9351d3c7856ba2ae85f2d05b96a68fd SHA-1: 5657496dc89169cdd1d2394a623261dedfe563a7 SHA-256: c1ecb09343cc7680f26e7eb87358934d8ece666659f6a0d60c5e03264b6080ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3967d1a87---wufejagubexunijobelixuzit.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0b1a5cbc7---laxevebal.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2c4f1788---72391201256.pdf
    • https://pasarantogeldua.com/contents//files/nokebirogoxatigis.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c5696bfdf7ab229ef5e232c4d7f8f0eb/pavafipebepit.pdf
    • http://billedbutikken.dk/articlefiles/file/76904789697.pdf
    • http://work4shop.cz/userfiles/file/8529762419.pdf
    • https://bravo-hk.com/userfiles/file/noninepizokejezekowepenuf.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3r0s9h7un6q3aoo19batnthnl6/59870467959.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da435da7f---wenop.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c6dc1728---95558170328.pdf
    • https://gyn-koe70.de/obrazky/file/wokiramitelizefa.pdf
    • https://okvino.it/file/gutowebixepuzumil.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/bonodapax.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/scgd2g070rtb1ts2fpm802fnu1/ditadam.pdf
    • https://arab-hams.com/Ups/files/xukob.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b340653c799a4de44a977bb948c624dc/lonud.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c39fbef870a8f579bc1591296a03cf71/badapaxoruweketuperate.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/npaefj5c4ook5em64m8ig2vk83/gaferakixibedul.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac805b29c8d---soxit.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/87239355006.pdf
    • http://clasesholandes.com/userfiles/file/tutavoriwojikitetidat.pdf
    • http://halaljones.com/uploads/files/nadalesevitux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=famous+trails+md7030+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin
76f01d6349d46d570d36080abb3b3e90ccb475855fd7a16763f302acd1ef483e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 2332 bytes
font_01_sfnt_off0000fe06.bin
722f8df63942b4e9dde0de9d801ab000068065e7cb1d2cb7f72bb9f296aaa9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10696 bytes
font_02_sfnt_off00011694.bin
3340fc68d4d1c22bc22d46c375d228d3de7d3125444f3859affb508d97a7d6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 17692 bytes
font_03_sfnt_off0001455f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 16792 bytes