Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea559bba9a91572…

MALICIOUS

PDF

143.2 KB Created: 2021-10-04 15:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a274568b8d67e4b19ca96dbb40ba82c9 SHA-1: 84afa2c40a5dd1dd4c2ded33ea130ddc18758c58 SHA-256: 9ea559bba9a91572802633b50162f85b8ec5ada816c2e06b673d75709c45ff18
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • 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://airbays.com/userfiles/file/77589515.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149807c02653---46666047194.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7bd8f03aed5a44899ed2c266b7e2f0d0/wopokexufatofosedeve.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/wawokatotodowixowa.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/litanatolewerozu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4bb297d3d2fef76c4c11831ea85eb478/10567456076.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc209328fc---zavebegomiwedunowosowufi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60123614342.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juvodixeku.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/kozezitanodonobubob.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/40247628746.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/91646995636.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/paxojabugapubetadora.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150b77764ee5---20967428630.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/73937716620.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/97310382326.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/13907562219.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/durimamezikazobopoz.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///bumobufupisi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/73555436879.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/33968312527.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/73393423071.pdfIn PDF document text
    • https://comfort8889.com/upload/files/zomezugofidusulil.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/11783158016.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/muvobujofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=does+the+bible+address+abortionPDF 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_off0001c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC3 10484 bytes
SHA-256: 3e98c54b8962c4fd7189ea7b2eab7da7a6f47c76356d8775f16fd20ced955b60
font_02_sfnt_off0001f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F379 22952 bytes
SHA-256: dcaeff605c3d75c3cdad0e1b9b6f34d9169154b35c3a86d7103e13e12168c3df

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