Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7e869f2b92adab…

MALICIOUS

PDF

90.3 KB Created: 2021-07-27 15:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e35422219713a5216b261170f3dec6c SHA-1: be7e96942c3a0ad5ac42913c2739295965799d5a SHA-256: db7e869f2b92adabbe065a19c578b2541d0a13acc5d255129c4f483c5c8b723c
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or distributing further malware. The presence of numerous distinct hosts and links indicates a coordinated effort to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/84003e74d85b3088616e0044b88cd6f1/15108877467.pdf
    • https://alakharia.com/public_html/userfiles/file/53206075070.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca743c68e0---poregajolujegojewuvo.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/sajutefesonikemakeven.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/d55o2krmr50urgchhgvlij1883/58859092045.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b7f80939---8730494050.pdf
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/bajorul.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/jalezejurorizuxekujapazam.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//53538623473.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5dd49fa41---44541944063.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4dd6erk57jup3f3e1sg23ptbt4/wejidodu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1b33e3bf555a0118281f056f43c8210c/sisesugin.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c4f30640---gawefa.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3966b7b34a---tutuz.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb020d9b460---manojurejanojirawewakaw.pdf
    • https://gadd-asso.org/userfiles/file/robalodugagijeworufovid.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d73354c86---rosixamakunupomokalunolu.pdf
    • http://santabruna.cl/upload/file/55390119514.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a7b01260cc7525c2ce3ead69aae8c8ea/revagidabukil.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf5c972d7---26654236620.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63c0d10103---buzosuwesowijujiza.pdf
    • http://phuocthuan.vn/images/pic/file/sodemomolisekufatiki.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j2sf6lg2id77d3r5vlbi60bd81/dusavidugewidigaj.pdf
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/semove.pdf
    • https://devismesport.fr/userfiles/file/keredesokog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=madea+goes+to+jail+the+play+online+movie
    • 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_off0000fb8f.bin
f510b5384c613c485f3241a23a6675c8b504ff5f876a8dbdecbaff5f101ed65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 11040 bytes
font_01_sfnt_off000114d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
font_02_sfnt_off00012ce5.bin
6258887b1c0f065fd232a58bbdb30f643a56a1a280299f19af8e703c59c4ef67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 17524 bytes

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