Malicious PDF — malware analysis report

Static analysis result for SHA-256 669aa09feab6921a…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 01:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a29a892c83f7aaa21982cf5d5716d95 SHA-1: ec707542909ecbd80944f3d498ee1837dfd87023 SHA-256: 669aa09feab6921a358709aaaf837e5c2432f4b6c55a6831c5d748f859c8145b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to leverage these compromised sites for hosting malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rugsinc.in/UserFiles/files/5197781571.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/accec9888e989f0db209f4380b7f6ad9/6631094888.pdf
    • http://isvpro.com/custom/files/32135043646.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f640188b96b---narurelato.pdf
    • http://streathamtaxi.com/survey/userfiles/files/75003528280.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412ce54b95---nogivaxifizasupab.pdf
    • http://ranaghatpchsschool.org/userfiles/file/lenijubufudivobeni.pdf
    • http://goldenteriyaki.com/uploads/files/xovebeloxusixaworime.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15845e89---83730599035.pdf
    • https://lasanisports.com/files/50084009441.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/14378244250.pdf
    • https://alarouba.com/ckfinder/userfiles/files/venigotipiferawi.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/vumufufosu.pdf
    • http://ramenzoni.eu/userfiles/files/64196691206.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02759bfe1---wigejurukumola.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607633f3264cf---topasuv.pdf
    • http://jikaramen.com/uploads/files/meriposemixusuzukulovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+does+a+hand+pallet+jack+weight
    • 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_off0000db0e.bin
86807db6994bcdec2af0e7f76ccfa7e54a5cde5ec98360bda43c3cdbb6f130f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 11260 bytes
font_01_sfnt_off0000f515.bin
f734f26b24aefa9748f7070aedb3206e0c86549580a013c56aef05a101b2f4f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 17596 bytes
font_02_sfnt_off00012355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 16792 bytes

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