Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4c5382bc8af245…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 22:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02b1b626ac4d560a4feb472223edaea6 SHA-1: f54ae907578de76897d391879ebeea30ecc6bad9 SHA-256: 7b4c5382bc8af2456723d76db1becffbe37bd869e577f6e217d4319496bbdb61
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queensparkview.com/image/upload/File/nunazorelubaboki.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/gejinapibejaze.pdfIn PDF document text
    • http://roocenter.ru/upload/file/18949884864.pdfIn PDF document text
    • https://trainova.com/userfiles/file/gusoruzumibareg.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/24513638627.pdfIn PDF document text
    • http://lovesenergy.com/file/37925255283.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/62318975385.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wapeximifuxulisijasoj.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1c84e209---63326055856.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ranatulosofinib.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/xedowupum.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/72525524997.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317aa3180e6---risekapipigapedixubixuja.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c15f51bb5f2fb8b3cf28a6ea1172c7e0/23717023038.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/99995850731.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/ponadegizun.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/15463842015.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/40039144647.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/wixitumozuri.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70740444528.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e67f5cf06---38710135068.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010728511513.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/wifivakikeluwojum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aebe8ba78---muvumuzutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+open+developer+optionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 18228 bytes
SHA-256: f1bd25b3913cc195791e74dda8437183687ee07acc2afeaaf8e9c8c349f9bdbb
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 10364 bytes
SHA-256: 7ce0215d88c848a6430e1ad9917b035519c70b8908ad387bd3eca03685c75eb3

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