Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bdacb22e2dd600…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 11:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e3af6f6e61a4aa3b40162957294783c SHA-1: a0e916f50f293a52f29a804be75b87ac98c0cb72 SHA-256: f5bdacb22e2dd600584085ec2e79cf426fec4bbff1e9c747e2ffe54c7c8564a5
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to potentially compromised hosting, indicative of a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or engage in callback phishing. The presence of external URIs and link farms on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://usagimatur.com/files/others/dagenuteganesesazod.pdf In PDF document text
    • https://alohasafaris.com/files/birukabezepefos.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/49642339846.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3718e4a7---rokololonibadefexujoledom.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/koxesudazor.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/kapaseneluruk.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde574d290---wuzifudesule.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/97137662785.pdfIn PDF document text
    • https://dintek.eu/uploads/file/noliwamuxipusagoburot.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dejudozuxigitivi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/97649016234.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cca65cfa0---fanikinebukutarosajiwir.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/34571808218.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/92303058468.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/febadusosenaliledozu.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/juvusegigadifoworigifenen.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/10125388804.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/jinipunifu.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/dativuxotavowozupi.pdfIn PDF document text
    • http://logicamail.it/draft/media/xosuzop.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/faxafesivu.pdfIn PDF document text
    • https://agatanorek.com/files/file/tixobuxotiwaxisaniwu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/60348724578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+exorcist+screenplay+pdfPDF 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_off0000b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 16452 bytes
SHA-256: 138b05ea5563e1ce9df2cf0b201e82540d89323f0a262151b5db387621595b7d
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10896 bytes
SHA-256: 8e060bfb899e2505f44af7c5219c2b9a9a70604eb8be761d8805bb8324b1536f

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