Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ededdf000e7e3f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 10:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc9abc004613b1b1e015207b57442760 SHA-1: 59748e67ff2a63a67202f921308594914a758dd0 SHA-256: f1ededdf000e7e3fbd87d4c3b6a81188e84eca5431371555445068f4f65cbb66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b7409f03---beduzobagofu.pdf
    • http://benthanhsgfarm.com/images/uploads/files/21290542932.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/72830592330.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ede63bf31abf22a3f21488012bcfd8e6/79296351319.pdf
    • https://alrukn.co/userfiles/files/91811436491.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2aaf97ac65dca5669ddf5358f3b5427e/81919825675.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rd6ou0vqb2t4e0kbn8bbcpaam8/nofek.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1a0k8afmkcgn995m7mcqa1ol62/zibewuwup.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee18204f6---62830549704.pdf
    • http://coytex.net//ckfinder/userfiles/files/gowokuk.pdf
    • http://astro2sphere.com/admin/images/file/bugatukoti.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fae52e496---bemujakumokudatixov.pdf
    • http://msamerica.net/clients/873634/File/32305317938.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/68600864013.pdf
    • https://candbco.com/ckfinder/userfiles/files/64788530851.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b95268da3f7---64727028802.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec90caffbc---84513045170.pdf
    • http://jhferry.com/data/fckeditor/file///21351604354.pdf
    • http://vietthanhstone.com/images/news/file/46588601837.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7a0022aa12d989b8ecb8b8808d2ebb84/rotufenadowuvunorud.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ebe1f6a4ca829d033db45a0f8eeac41f/447388595.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=to+all+the+boys+i+loved+before+watch+free+online
    • 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_off0000e982.bin
5c91a15457adebf303982ed16cab6b65666edd12dc837aaf37bcfae91272e71b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10944 bytes
font_01_sfnt_off000102e9.bin
1aeef8903cc564c8a3a2cac67e5da980a827592693c1c3acce2fe92242d1bbf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 17820 bytes
font_02_sfnt_off00013187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes