Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a1e3ea010bd707…

MALICIOUS

PDF

125.9 KB Created: 2021-07-07 02:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: abab475308bd59565a596b615fd3192c SHA-1: 8ce08f8234872ca7d835a69e154195b054020871 SHA-256: f5a1e3ea010bd7079c258966ed47fc29cf16250f11ba70cb55d57f8e7f43fe8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dffab66ac---xekokesubabiki.pdf In PDF document text
    • http://pokemom2.com/uploads/files/pawitijamutivagobosuta.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/60282074411.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/60400472703.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/benivat.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/17790446649.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb8512cf8---50967980457.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/81838809719.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ad1f0695d377efdbb423c588023fa018/wokorexosejejupepa.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608231fcedb02---nebegasevad.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a1f138a332ac760aebefb1fe7833c1b4/mefinixubegare.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/36096002299.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/7306110244.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rhdod7jkhoc5j397nsd9aee6v9/17468110044.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6935033f5b8c3972876c156f0d0c26d6/74982170834.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/jm36e58lqfb6clc006cm96at80/37787684156.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/61041864395.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bebb7a06e---44491463626.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee645e795---xodupoxar.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/paxasapawajize.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/40558406701.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/naxavuzemadup.pdfIn PDF document text
    • https://naoshima-habitant.com/66741277762.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e23e11f806---80842522379.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97a1db762---bajowofoluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=eagerly+awaited+meaningPDF 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_off00018b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B51 17996 bytes
SHA-256: 599efbc1b9bf72c8753979bad5e9ad1e8408ef3f800a70f468472faa47ea85b7
font_01_sfnt_off0001ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D282 10484 bytes
SHA-256: 220f44d2fea5fca6641fe0c09e944b270d5591f06a2416b55522d49946f1f257