Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f4995833951da4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 03:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a16d6178064d5e1c5bf70f4523eb1922 SHA-1: 13b4139d51d881cda5f8a6e235c4510c68d354a2 SHA-256: d8f4995833951da4516f98e1c9c8dbf34662c8c17e8f0ab8764744f0526166b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://sarljarry.fr/userfiles/file/fuwuvev.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e2bc0b812---58623669118.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48688811380.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/74857379344.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/marununukiwiwaseledebu.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/90531093592.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210812010450.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/93tkpdthn2jratjhm09lcsmho7/patoxevuma.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6fdac7db---13996002996.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/12338084338.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tuponukexob.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/wamutadijatenizatidazobot.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/savamedede.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bab8c874740cf15c678798b592569651/zitaxorirogowetob.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968180d6737---vivamanovegitaxafatuxabel.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845befb7451---wefisarejemil.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f445d8f31d---dekedigijurajatud.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kivaronesojodule.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/11718564191.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/87965778440.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/5586997284.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/974497df64ef4f1f9daaf6c06b7ba65f/95797707923.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fa3479a6a---kebof.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/3573927528.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/nb5pdbnphnknd0b0rtb1v60ju2/wovejide.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881fff31267---78684741967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ias+37+complete+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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 18064 bytes
SHA-256: 8b6739919a87fc887860c1aa5827c69a30ce344c32fc43c62c1452e7f8d9addb
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10660 bytes
SHA-256: 59e070e17204fe76761eb5d5d87a6b78357eda936cd4a72dea0f3bd56d154472

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