Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16a728a90be7dd4…

MALICIOUS

PDF

136.0 KB Created: 2021-07-14 10:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6db339610794350483f229e504a8d967 SHA-1: 51cc59ba96f10a1ee55162cf0b294e3c33ad42cb SHA-256: f16a728a90be7dd4d9d4def91228e4e5a8ec3b50ececfd09d7a8f15198370986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9430

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://headlinesdinerla.com/uploads/files/rutujusidozefozixi.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3dbbc13c---jinabevuwoxejenuru.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/41942956147.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9c1991a4---74019946488.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/766e71c91225a5d5a6338032acf156d4/66038705187.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bb0091f5e42ad195f017a2fc66aec06b/zibagenegu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083adbea59e6---1024047294.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3a3ba381---51789463133.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074206e41799---77965019987.pdfIn PDF document text
    • http://canvangdientu.com/images/file/kilisizew.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/94f63ead237654da165d529ae7336aeb/72362278832.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0d090928cb18d0763c7078dcc0c0f412/kifevogi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/069859f54aa64c1016a14ce6919c72f8/83954039336.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16071987f3f63d---tesupoje.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ced28aaadce2e46a13a9d80e522ca9a1/25136851700.pdfIn PDF document text
    • https://citytrafik.nu/images/file/wigubififubigeredonaxolo.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tomiv.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609790985b5fc---kenafilegoriditi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a21c23e0d---nasugemobewudazexavudon.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/toxup.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8555bc71fb341defcde51535ec56f430/zanutinisibevudefusuboxas.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/nixujoxedapopomi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c2dfc141bd040271d3aa6d495fd771ce/gokuriropovufumurazipe.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/ledoromela.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7hadntd29vvgjuo1ihok5jguop/32265244032.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6e6a6fcdf3f757fc2902d59e3379d438/xaritet.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/92ar8moj93hbfeofbn5ci98a0a/55693390085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=select+case+instrPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F68 10180 bytes
SHA-256: cafa7dd1416c0abfb1fe3dbd431a2b871d6c98d830dbd120330e911e135f3219
font_01_sfnt_off0001b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B640 22320 bytes
SHA-256: 4e54d8114a56e7d23003df922f012a6977b7f6b28109095f90c490c4e696ecd8
font_02_sfnt_off0001f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0FF 2316 bytes
SHA-256: c72d05642130447a720fd1e3fc36edf5ac03f0beae1c5c1a34e59a5f5924323b
font_03_sfnt_off0001fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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