Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda5232db14caf69…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 11:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a06644dfd90fb931c4b22b56628b8a75 SHA-1: a9fd4caf370db4e6b6522107af043a3df9562b80 SHA-256: dda5232db14caf693d718d72409a88316b2b0c2442d02dedcd00bb58d5dec4d3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. This script likely redirects the user to external URLs, as indicated by the numerous embedded and linked URLs found in the analysis, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://crysiq.ru/uplcv?utm_term=bullet+time+game+android
    • https://techielingo.com/fck_uploads/files/12295447098.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/pexiguxulenajejoxixujoj.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/ranet.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614668b54d3bb---64342788254.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef2fc10fd3---71875665341.pdf
    • http://feldbach-tourismus.at/files/duxemik.pdf
    • http://kssi.ir/public/userfiles/file/91629968572.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/getumusijokufevitenope.pdf
    • http://hoya889.com/upfile/files/20210903105834.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/23641004015.pdf
    • http://poketomecam.com/uploads/files/xiradipivajetelapexolil.pdf
    • http://stilna-ya.com/_userfiles/file/boxaboxamevelu.pdf
    • https://mosallaesf.ir/uploads/ck/files/vujigab.pdf
    • http://twilaw.com/files/files/91498448352.pdf
    • https://ltssinternational.com/res/wysiwyg/file/mivuvudewuketodurizofuj.pdf
    • http://vanillasky-ch.com/images/files/zusijefegilajasujixariku.pdf
    • https://sharedsynergy.com/userfiles/file/69999561372.pdf
    • https://air-separation-supplier.com/d/files/vazawatububutisotot.pdf
    • http://vicc.huh.hu/UserFiles/File/nopebaxon.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/zizedipoxikajufoxesogewep.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6511dd4c0---tubutuvemov.pdf
    • http://havefuntogether.com/image/upload/File/gubivejukaguzobifevigu.pdf
    • http://karinameal.ru/imgdish/files/17313027036.pdf
    • https://fajanav.com/aym_image/files/54152822944.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_off0000db53.bin
31240da851294b9d697c78ce70c74d0a37fdc5ce1be58c7ac4a255ff6e6010b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10576 bytes
font_01_sfnt_off0000f337.bin
a69d10c3a8dca4f7351361a0719353c6473fdf1c2f09a3624b403868b84d038f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 17328 bytes
font_02_sfnt_off00011fe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes