Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd4eb1527172bd6…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7b4c79baff40c3e4657b0ab0778cac6 SHA-1: 0fbe97ca2f984abe2d2b015edaf464e199b73da4 SHA-256: fbd4eb1527172bd604327ecbaa04be5e438e4a7da12a46e7ab89e33020477948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://cariboohose.com/userfiles/file/manubovagubaxiweva.pdf
    • http://cnkls.com/userfiles/file/1625188779.pdf
    • http://sierrahighalumni.com/clients/878712/File/81453463347.pdf
    • http://gianniarnaudo.com/userfiles/files/wisaxebipexutokak.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ee680fb7c---11351595771.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/86251909260.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8ef5a388---momizugedej.pdf
    • https://adasms.fr/userfiles/file/nijebarujajeroxetovopel.pdf
    • https://murtenhof.ch/userfiles/files/73603826375.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/735287b54bc383f639cec02372b4010d/43641403392.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8mpksqt1r6kureb8i5160itvt7/87160325563.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cb75d20171df7c5ef11ad0d815edd07c/32704138278.pdf
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/96575192854.pdf
    • https://associazionedynamica.it/uploads/file/2663988626.pdf
    • https://ijpdua.com/contents//files/25574518210.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bneqfp85sammcgjkaa3m35lesa/73773886723.pdf
    • http://hopkinshigh1988.com/clients/75739/File/56152003995.pdf
    • http://historia-bfured.hu/userfiles/file/mezituxaronexejosigumi.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6bce918a---kenobidamizovibobes.pdf
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/kosamudezafidox.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d24d17976---waliwapuv.pdf
    • https://stiff.pl/ckfinder/userfiles/files/58454152016.pdf
    • http://narnivet.com/userfiles/files/narujiles.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=blot+out+the+sun+meaning
    • 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_off0000c3e3.bin
fcc0bb8658c7675ab1b7a49bd0e9b4e15a02a9247831e1fbf5b2f189803e86f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 17404 bytes
font_01_sfnt_off0000f105.bin
876eb879b34520c7aff1703a3173a6507873afc2b889b1345a2d6dea70786af3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 10608 bytes
font_02_sfnt_off0001091f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16792 bytes