Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0c9dcddef18197…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 16:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a15bcf764c49b112eb8eda73402d29ca SHA-1: 3d55a8dce1653f983c273f8b8441a42c18072d09 SHA-256: af0c9dcddef18197323912feb98c38f8076a18f679fee0d9d62533d6bda5e5a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a cloud document lure, impersonating services like Google Drive to prompt users to click on malicious links. Several heuristics indicate this is a link farm hosted on potentially compromised or disposable domains, designed to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ohana1bbq.com/uploads/files/21940834616.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cea122b00268ecde6784cadd9f9d05d/60745403687.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/161ef74f50fa5e27e1d10ab6c48071cf/famasunapegozep.pdfIn PDF document text
    • http://poorclarescork.ie/images/sadofaxipixoxolowa.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/3706328796.pdfIn PDF document text
    • http://kelvista.lt/images/files/50893346511.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/62e1eeba55a3c0aae0b11d7cb17a240b/55109665443.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a147d04b6597d29592d5a7dd0569cb71/fekobowixawirexolo.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/rodamefofadoxotomefube.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/bokobalebefasos.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/75593914313.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jugokalaxogexubupi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3o79sda60se6egdg0s4s5oktqi/samanolakepesawemejezena.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/39589926013.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/47361597408.pdfIn PDF document text
    • https://kawanmto.net/contents/files/lejotad.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071303484846.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c4c1ff87---53903213481.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/1327343889.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2cd0d7be---jawulimaxidirawaguxe.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/lekijubob.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0f4c13d2648e1f34b3a6962076b7f3ac/65687376576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+download+tool+edit+pdf+filePDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16852 bytes
SHA-256: a68ec1befa8eeda61bf1553391084a23f335f25652719a7e2b4dbf7583983f2a
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10384 bytes
SHA-256: 4306f78ae2c367bad0bf472b53930216cf4402a63fb48df54b009d9e22c9d68e

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