Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f017f7da4c47bf9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 02:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7273b8563ace14a116bc894622e1647 SHA-1: 5cde78fff886aaac017afe303d207eb83aeb8b8b SHA-256: 7f017f7da4c47bf9c447f408cca7aeb03a1152b8978f9a28f28a14923161ce6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting services. The embedded URLs, despite some being marked benign, contribute to the overall pattern of attempting to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://gres-k.cat/userfiles/file/jiwiriguvasivojirak.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/54561533784.pdfIn PDF document text
    • http://aven.su/userfiles/file/30698954753.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1e74ea62---42640651853.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/5270250183.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/jadelewelefikeguje.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/32464379485.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/29708946117.pdfIn PDF document text
    • http://onelove.cz/file/zamukagajisazirapotinij.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/1400090386.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fafesewanete.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/95369764285.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/fevajovoxetugexiri.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/xiwubivoniw.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/mezonaximorob.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091305504799.pdfIn PDF document text
    • http://regmac.net/userfiles/files/4569038268.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mfl1pdsb5c482hcvsulvlnniga/32993696887.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/53928639573.pdfIn PDF document text
    • https://baongochoa.com/upload/file/58629116159.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/35e0a435d48c0266119f4d356c11a391/40830252649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=zuma+deluxe+mod+apkPDF 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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 16092 bytes
SHA-256: e4df3d48b0d509acebf7906fd5156173531f07090fe57c8cd0a7640c77809e4d
font_01_sfnt_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 10248 bytes
SHA-256: 783a9ade72620768a68d9eca4edab01b8ec3229d299de2a5a322acc9ed639a7f