Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c2d2bc3b73900a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-12 01:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5fb2f29cf0d5fd21e68c637db8e4b84 SHA-1: 7c45a926fd76f9e2b00bc3f783e1a642b4b44844 SHA-256: 12c2d2bc3b73900a864a70f98c34cddb339e0c8bd23c82df218ef70ec7b53511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://investin-khj.ir/ckfinder/userfiles/files/48885200332.pdf
    • http://boissee.fr/userfiles/file/bugafefopu.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/850c68121796666447520db8dccf405c/69863596056.pdf
    • https://agatanorek.com/files/file/melatewivubasenoliv.pdf
    • http://mackyz7automotive.com/js/upload/files/64517950041.pdf
    • https://hongdung.vn/ckeditor/images/files/polufedavefukozir.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b7e98a5f0617be422288ee08c0f3059a/xexotizegusonuvabutiwusov.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/werunanimepo.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/22890502978.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438657178c---69041352875.pdf
    • https://galedo.cz/www/data/cms_files/files/49911243124.pdf
    • http://sity-luxe.ru/userfiles/file/64510643682.pdf
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/defuwepulesipamuxoz.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/19051b5e4829898d3499291dfd302277/zevezifaz.pdf
    • https://pharmnet.cz/ckfiles/files/files/xawetovimabejujep.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepigu.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa50d850d---96192822733.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/wavezeg.pdf
    • https://cobrawire.com/userfiles/files/20704026794.pdf
    • http://haiqi-machine.com/d/files/maxawuler.pdf
    • http://rowerowaszkola.pl/imgturysta/files/dogafowajalugatubuwov.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe52ce59c---botumofepozibiratuniw.pdf
    • http://kubablimel.pl/Image/files/4299079687.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cinema+apk+tv
    • 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_off00010140.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 16792 bytes
font_01_sfnt_off00011957.bin
500198d667e08babd7d144fd51bb7d862ee15b48f2ca71be8a5f6660dfa92bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 10168 bytes
font_02_sfnt_off0001301b.bin
5d2bd2117360a44be75bebbb3042a77fabecace1c9b4de9463dfda113169cc76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 18980 bytes