Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f920ee3b9a6cab…

MALICIOUS

PDF

97.7 KB Created: 2021-09-06 18:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41a6cf9b8d1807af95cd8a4bf4f48e10 SHA-1: b418e4d8973a2ea451bed421b8da8451a3b578b0 SHA-256: 22f920ee3b9a6cab15fbf622c5bc205572a7722296ff14245e9f2856f5138e8f
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 ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lalinpress.com/ckfinder/userfiles/files/migixofojudevasimavapopa.pdf In PDF document text
    • http://solamsys.com/userData/board/file/35507878195.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eee84ffb5---47626991473.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tb16osf3pkeic8t6b0id8picus/gewezinoti.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/defasiduxekagekawarerosek.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/7857118704.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/6036566804.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/21388360219.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217cbe3279---dudemamipexu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3faae22e4671db188718fc5ffa2ddeb3/39998974437.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/99278450609.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9173f66932---fujeduzamadalaxexutujaku.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sivuruzitediba.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210615180536.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/26821395358.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/koridugatuwunizup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fcrno8c2nv2bnmi7mgmbm95qu1/garegobagasajor.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/40309739160.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/gofop.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/85747006272.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lenugisuboxes.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0cca9ccc6ad33ce2d9c3877a911190b2/wobasalor.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/64020920991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vandyke+vshell+manualPDF 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_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 18076 bytes
SHA-256: a1180e7500d394125b9027ba47319303cee9ac3ea8da17b2cb5c93c349c14816
font_02_sfnt_off000161b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B1 10444 bytes
SHA-256: 3dac9cfca337ae429eda9077acaaf6d1fffc8536e7046cae919bf99ab813a552

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