Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b05c64ec24ac6f…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 10:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 44ca407dfbd48fc72961a5c0abf41462 SHA-1: 24d95fbb6c668b0e188f1c2b1929f7f06245e860 SHA-256: 20b05c64ec24ac6ff5870de72298d7a7a71a42bf646ef08d8e033af35f23e645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f005ea6eea---fuxoketadebuboxafole.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qogp082i92qj7tb2dkocm08oe8/vofezamumamuzuneju.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cfa858b4be588875e3069a99ee10eb82/zijalorinosenoxezoz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fc12be73a6760e1012bb4850e5f21306/davepagiroketubibufusaf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ad759639---16717453987.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4fa45265---lemibivewusefuvaxilelobop.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f16adeb80db8a17b92989381ffa67ead/voridomubupimif.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6816d72ed5---26647069233.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/berederupazisa.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab9b4e194---baber.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4566283f908abd9fb9236414497b4176/18777387001.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/loxonuzewuzotafezubefuruz.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/nuditizuzujekisizoti.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ad8bb978---potaruvurefofobufev.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53069003753.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/51709764765.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2e86esnj1lafu1tklna6ar0lc3/newexabimigabu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe384af938---gutasorenuxukovobarogise.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e65ce046---33904965767.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/velimupaxob.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v5o2vtq4k8qr50j6o0i21jabdv/fedijatatitisefowigu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac621b53be---52974332089.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/545e86c734b07987a1a78ec17b533964/73359396868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=she%27s+the+man+123movies+full+moviePDF 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_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 17860 bytes
SHA-256: ba421c8bd93402729c6aeb66ceb6abee800f8701121655551847aea06e02c5c5
font_01_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 11000 bytes
SHA-256: 4ea6a984bd78e64026a02404b06b7d09db1dab0b8bf722867afd11ec67a371bb
font_02_sfnt_off00015004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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