Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0bc66944f31d2a…

MALICIOUS

PDF

85.5 KB Created: 2021-10-13 14:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88af94b607329f4a033fba5ca4d8032a SHA-1: d2e6495ce3a8313637c6efa0566e1ba5e5bd74a1 SHA-256: 3a0bc66944f31d2ac64c47f465c913791f92cd3255fdbad7f034408c4e021526
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the SE_CALLBACK_LURE heuristic confirms a callback phishing attempt. The document likely serves as a lure to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a larger phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/48a7a6a48396b621671b9ef8a513eca8/57251097775.pdf In PDF document text
    • http://citescolairedeledit.com/include/file/15950404586.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-16/images/files/bapubetalij.pdfIn PDF document text
    • http://shesob.com/file/files/miboranazek.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5c95f5b8---25471882902.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210901_E083EE07DEA44C83.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/14725162839.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gugumowoge.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kuvoxirijefufuzokuro.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/46778399056.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kapukawesuw.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/tisomofegelajeberuzuzo.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/robowoleg.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20211011144554147.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/79619725525.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/zuwetonotofidebopisepa.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/60103004753.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464bf1c555---7878937231.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetanax.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kalifajivoferede.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/59025973066.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-7/20210907231522577742.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/notovuz.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/nisudibavamaxotowarefo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=how+to+save+a+pdf+to+your+phonePDF 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_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 19320 bytes
SHA-256: 9aeabafd24aa24021ac1674d3108e996fa0216dbb30432f790384915b2936b4d
font_01_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 10816 bytes
SHA-256: 37ded430b2b69a0a4b5b2d5d21a42eec5c79f2156c683c23586870f75ed22236
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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