Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd60f0a7ada1f88…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 07:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eecc1910230e174f94a0dc2cd3447c37 SHA-1: fca27a71e9a8a5a8b3853f09d97c616612c5d4f5 SHA-256: dfd60f0a7ada1f882f914a83c22c4e23c03a8f647a61d9fd8057c2b77979c05c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to compromised websites, many of which host further PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flags this PDF as malicious, and ClamAV also detects it as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095991d22f1a---9662148423.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/34434801527.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kenetazegifaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b71cf3b9f---93230498392.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/fifejol.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/13229642955.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8fdd2c0b---42487316424.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/zadejizazulumo.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/vinetana.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/60p4s3m50nstfn7vr974v7bl4i/68860479119.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/debarasosaxas.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770194dcaa3---xakemufemev.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c293f0c22---bojukowokowilozedamab.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/sujolibusafevafam.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a395cf04f33---30482523494.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/54112785629.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/xipatilizadapolipit.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-6/20210806121426177907.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8b0848be0ea904578394e5ef7b515e21/ledezowurelefapetuma.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/bc57b9161f9aa8d677283610ed8f77fa/nuzegesopovegidamona.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/59419209889.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e6a24013---reverafe.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/cf08d07b9b1c97bc0954865ed9890f00/61676003596.pdfIn PDF document text
    • http://irollee.com/userfiles/file/toxinaduzovagilesuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simple+authentication+and+security+layerPDF 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 19056 bytes
SHA-256: 2988adfd85d3f8fe87d542eb13830322b97876fc71e5ced5335203dcaba1cb72
font_01_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 11068 bytes
SHA-256: 0bf31bed1fdc778d256183bf72c9b05601190c2549b2eff495242e74a9155a70

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