Malicious PDF — malware analysis report

Static analysis result for SHA-256 10018af27c3eebe5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 12:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23119596c1bb0521029214c0f04cff5e SHA-1: 1b8f714cc00b6192b4718d73f47d5b8d6db26f28 SHA-256: 10018af27c3eebe5fd4e1a41897100ddc40e665b87fdfaf8deba55df708355b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one identified as potentially compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://balone.net/_upload/file///33836321305.pdf
    • http://schokofontaene.de/idata/bujumujifenamoxiguwemidi.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/25917811800.pdf
    • http://maslag.eu/userfiles/file/niwija.pdf
    • http://arci-mp.fr/admin/File/50870865415.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/34184028495.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b2551b83da8db4603a49cf41a2a6e8b/27072073740.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3886ddec---wutikazidifav.pdf
    • http://volkshilfe-vlbg.at/images/content/files/ruzabemor.pdf
    • https://betenagro.com/sites/default/files/file/gijuviw.pdf
    • https://weishinclinic.com/uploads/files/202109041438479050.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/76621332455.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sixedaxovox.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/28224705081.pdf
    • http://castudio.eu/userfiles/files/72429412637.pdf
    • http://carzip.biz/files/uploads/files/39220137418.pdf
    • http://immobilier-valence-agen.com/userfiles/file/lojesodopokoberev.pdf
    • http://www.szphotar.com/admin/img/files/72372023609.pdf
    • http://linuxnewyork.com/draft/media/94347453246.pdf
    • http://silver.jo/ckfinder/blanc/files/giluturixidexov.pdf
    • https://fultoys.com/userfiles/81612192560.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/seliko.pdf
    • https://minhvuongthuphap.com/upload/ck/files/dexenatujuxulefiludowe.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/87448492210.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/714e909c6f9bf7a2f275d008f841cdc0/gubopubetalebamal.pdf
    • http://stavo-bazar.cz/userfiles/file/87887544870.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee7e3c75---84432221315.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zugepetoluledegitok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+dukan+diet+made+easy+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_off0000b3d4.bin
008cd19ed0d403b40d55acaa5e5769643a26c16827b50ef86bfb0b54ee25a8df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 10764 bytes
font_01_sfnt_off0000cc72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16792 bytes
font_02_sfnt_off0000e484.bin
682c3cf5b76e28a80e376b42515e36da5d818cefd7b43d50032c22abfd180a52
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 14296 bytes