Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24ab1106b4bb9fd…

MALICIOUS

PDF

86.2 KB Created: 2021-08-18 12:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ae536ceead983034ba576c2f104e4bc SHA-1: 9b8706ad295be6413d984c69926b414db7de0f33 SHA-256: a24ab1106b4bb9fdf04a88ce2ed1becb588d08e5db8efb5455e897c63d76e099
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, suggesting the primary malicious function is the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://actor-conseil.com/files/file/nofimajudusapesidefuxuz.pdf
    • http://bclgrouptt.com/userfiles/file/55784895885.pdf
    • https://eltechma.com/zdjecia/fck/file/55825239362.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1025e7527353dbee7f6f9cbb2752668a/38576032732.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/9455965456.pdf
    • http://allaboutdowney.com/userimages/barasavunudereva.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kcgjr5b228837735quv3k43pe2/89078734919.pdf
    • http://gioiacompany.net/images/upload/file/wusin.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/95608086443.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071a77ce4e5b---18869610519.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/42v2t7574cole1bcgjvh0vqja3/76978832022.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a019760843a2620ce981e114beb4e5d0/xupijo.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/38055261652.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b27abcf80---fomerugomaxu.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d05f692e7---46107597580.pdf
    • https://renesens21.com/ressources/upload/files/nopirusafilijub.pdf
    • http://mintaialuminum.com/d/files/ridolokogidunoredet.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/36048238790.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd61ac151---38647088416.pdf
    • http://cpgny.com/userfiles/files/fojuninawawegitexasap.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1bde1ee2---55867344908.pdf
    • http://firegallery.ru/img/upload/pijeziz.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba35496bce---72022823725.pdf
    • https://araprinter.com/ckfinder/userfiles/files/tadajo.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/71568938044.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vocabulary+to+kill+a+mockingbird+chapter+3
    • https://rt9.rspo.org/ckfinder/userfiles/files/bagidos.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_off0000ee21.bin
168c35566a47960c7e423690dbbe470e121afbbf1b74958d5702ec3801db85c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 11380 bytes
font_01_sfnt_off00010863.bin
3945a69858bf6333efbed05e5ed5f14678af7578eff58ec4f3b1bd2446955986
pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 16500 bytes
font_02_sfnt_off000132a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16792 bytes