Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d0c89393c72ce…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 22:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d08e279f0708618779f5fbd6dfc5be7 SHA-1: 2612bd948c8e63aecb67736115dee8823bbf7721 SHA-256: 7a9d0c89393c72ce773168f0e5dd9e621e29507c9ddbdfe5524733db7927a8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://curewelldiabetes.com/userfiles/file/wiridifus.pdf In PDF document text
    • http://18554080.com/userfiles/file/polipezenolezim.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/36183891877.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/9302008366.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/wudebojubojebiwave.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/47451991975.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/6574481761.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/loloviretevukuzarizugulex.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/64843593289.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/bozod.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161395c2b51957---mezasunekewamim.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/vidapatezofaxe.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/kenerotukigegeborewi.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/godubijeketiwewolanowiku.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jurumazodusetu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/73946847519.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/21835825235.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/zameb.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/75065872768.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/tazepiz.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/nizesamosajekum.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161304f57565b5---lubenanoxo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/defv5adhqp78svv6ubfth4ooqc/53849569339.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613695d9e6c1b---27219537467.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jakoziredabexiroz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033ccb7e8a---kasupal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=psc+photo+editing+app+downloadPDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10780 bytes
SHA-256: eb9a20aa05c781b24f3bed91a8faa31ee918d43ec22ca98f255c190e51822572
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 17948 bytes
SHA-256: f9b31aa8bfa7b2130aa818a94ceb97f4b71131899596c8b1a23cb48c8a8a90c8