Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990d0f3084cd62a…

MALICIOUS

PDF

76.6 KB Created: 2021-06-25 21:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3b428c93efa8f0cbd223b88338059e SHA-1: 1411dae6d20b8807f5ee394eda349e3835a07fd5 SHA-256: a990d0f3084cd62aa1451b76e31b3bf16d083e5e175f4b3d87a2e3b888e076b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many pointing to compromised CMS upload directories, further supports its role as a distribution vector for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gold-carsales.com/js/upload/files/finexofajumuwozexogiguj.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7426120053a9f7d5b23599e378cfa08e/82200583355.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d24d449c2f83c9901b0faa1210b106fb/31684275094.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a87132508---30828221555.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090b75f40cd1---befaxutasidopumadufokik.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f592030a2---nabokorogudanox.pdf
    • https://aartipalette.com/userfiles/file/nikupikamoxamapus.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2d94133a3924186e7ee5ff617168099d/68149437449.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaaf698f35---81397066637.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8vo4pv64v7u4r4jhj5jd6670ea/jifojexezolila.pdf
    • https://hogies.com/includes/template/uploads/file/batipa.pdf
    • http://ck-tct.ru/userfiles/file/43357161963.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/51a3051f016eeb15541da993013a6db7/22637900334.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bc40ac79b42c5d3ab566bb24337fed75/52740096478.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b553f29d49---bafanolefoxobizizukomobip.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/xitevuwe.pdf
    • http://bajcsidavidfoto.com/_user/file/xanenolowolugeti.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ko73cm2hki4256lqhacprqhubn/lixawino.pdf
    • https://amitadevnani.com/userfiles/file/69946378506.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/mazovimat.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e0b9752fd380933e2ffd37ec19aeeec/79745743153.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4156024dba---nepajuzidapusofinokax.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c39d907f---76624617681.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee50757cbf---duzufafuwix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mathematical+literacy+grade+10+question+papers+and+memos+2018+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_off0000c343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC343 16792 bytes
font_01_sfnt_off0000db5a.bin
c41a7f475e4d4c951382c9d0afc9f529b2e0cd2cd48671652a0459239f0694de
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 11924 bytes
font_02_sfnt_off0000f762.bin
583d5c2a3d42c94e2389baa976f91f0e6c3fd178220cee7c3325faa8341bd931
pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16408 bytes