Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2b05feb313cb1f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-03 13:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 274e78e0854c445ee25cc3f286ea98c3 SHA-1: ad332932f9bb8cf78a8a935135ff034e763e7d8a SHA-256: cf2b05feb313cb1f6935ec972c2d2b46679756ca526b30065a07cd8858bd8563
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDFs. These linked PDFs likely serve as lures for phishing attacks or as droppers for further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d66jd9ijauribdfh0j7mbcj691/64222709789.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7f7d4974---18371474667.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/750aac6fe159f01b4d20a1a7b6048c01/vixopimebotarikuletofeka.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16105d57dae247---benutidanon.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4aea242a680b6d15a9a04a000ba4964b/tugivapodaduxoxipuna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eb1d2d20022a1a89ec337c0e1ba9335f/japatero.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/721bfa1a9eb28ba85304e03bccc48de7/nixiwe.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/70525476378.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f25fec399d5---gidexabaj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/533c373604690ddbd49e0b32766977ef/pemavamobafakifobaf.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df17e45838---dumidikupa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5f1596918e9ebba32dac483f49d35e2a/44195477566.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lejivemevifetilir.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e87bb07b5ac8f2c9ba76421f25cb7587/porijabepuduz.pdfIn PDF document text
    • https://epiphanych.com/images/file/mifamenusozabafejuvom.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sagezegejujitijeliwobip.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/83708230821.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61763347292.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/47194714370.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d431f429c1---91249045417.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/71142142404.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/4664712663.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ektos78vp4pr7u6fcpkdleg19p/84701222133.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609851de1656d---53465831987.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1786a43812454f4ed8bb24987b6420a8/81749058715.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fe6402461889c720da6e94140e977d1/wifawisewozumojar.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/5132257474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cement+manufacturing+project+report+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_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 11012 bytes
SHA-256: 86f121f233c3868b7660acda3aa13f6f55db2ef275e499d6f7a404d82d91cf8d
font_01_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 18956 bytes
SHA-256: 6e4fc205f41047ab985f03191286e77c3e6f1d1ada5f355cce6913730e1bc705
font_02_sfnt_off000154f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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