Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e319b9208fdd265…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 21:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f62b0ab2a3c8d789718c152efd9012d SHA-1: d62b6fdec096890b7f84b8bd9abbf6b04f5d93ff SHA-256: 2e319b9208fdd2657b37840156c29a31b112f86cb20a5fd549486e224f2f4dda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.bramfordgc.co.uk/ckfinder/userfiles/files/fetaliluxanetofimaril.pdf
    • http://docando.es/js/ckfinder/userfiles/files/50149260112.pdf
    • http://mgocsm.in/userfiles/file/89490891681.pdf
    • http://hitecds.com/userfiles/file/kupenixoronugivifizura.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/samatunevigito.pdf
    • http://oprandi.it/userfiles/files/76503151437.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbindqpv54avue9hnv95qf5l9n/71158111232.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6d09887eb919add2e2d5d17f2613af4/wavix.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/18768080622.pdf
    • http://akcjonariusz.com/UserFiles/file/pexaxavodekolonat.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/wezilus.pdf
    • http://airconbank.com/upload/fckeditor/file/misitafasudavosupivemi.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/41b196c688c8ed6e7c05501112ae57c4/vuborurasetuwoguregenukex.pdf
    • http://veraschwemmle.de/fckdata/file/damevezamepej.pdf
    • http://cnc-soustruzeni.cz/files/file/15264995266.pdf
    • https://km2804.com/ckupload/files/fujumasexinove.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/965238b4501f5745c173a4cfe00d36f2/23952712525.pdf
    • http://archi1919.com/smlclub-files/file/molupuzuvezakogu.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d54c71ee7426079d9f721b3833a7f667/33588996863.pdf
    • http://hanhthien.net/uploads/file/gisebup.pdf
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/dezurerubapuvajasak.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/povupexovalebuva.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5c057c76---tamaramuximeta.pdf
    • http://fertilityupdates.com/userfiles/files/34594891313.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rezujozadubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jodie+foster+taxidriver
    • 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_off0000e643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 16792 bytes
font_01_sfnt_off0000fe5a.bin
10dd9e466c56d302bf31b5fe64acb95439f75e3ce4274b10c4746a2e8a27f60d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10356 bytes
font_02_sfnt_off000115eb.bin
e574c562aaa7190034859f47c5b45fc0633cfb38d917b064988af0059e72b638
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 17600 bytes