Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe19014f87583d9d…

MALICIOUS

PDF

107.1 KB Created: 2021-09-07 11:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed33ccdc84ac442c1bc01ac63f5f5b1d SHA-1: 09f7b03a134b80b114218465ffe3dc2033d4b560 SHA-256: fe19014f87583d9de77e5b697fb49f56e64156509cb89344623306511c991432
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://namthangbasaltstone.com/uploads/image/files/40403165124.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/85503f07b1f9ed6350fdddf9f9ed3e34/vedoj.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210610072542.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/itj9r6a1n1dm66jl5d9k0dq5ag/fesiwuwumasal.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tarifituwudobududomade.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced42375e61---nuvumotagiwijafadap.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/sunuraped.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e9c83d819a1be61a7f8e66b43f2700f/3843639183.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04c27e7d99ef463ad130dfa2517ad5e4.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1a4f07662c6a375101750fe2f2104f6f/tagijobajisulizil.pdfIn PDF document text
    • http://195exim.com/datas/files/66399405519.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/2211772966.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef3075a29---67699687298.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/samatemopufimi.pdfIn PDF document text
    • http://kme-kme.cz/files/file/96371682265.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/ledit.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/18717696935.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/42685065591.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9d75bc9f2efa657ab023ce1e928bdfc8/lotemosixet.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8e7854f8---5920566572.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/46328090244.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/jarefigesajamamimupojubu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/59682145645.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/kagumenusemudikevarifezi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/25811443949.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/dagirovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=septem+sermones+ad+mortuos+jung+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_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 11008 bytes
SHA-256: 8568b4741757d18b8e054dcc9ccd956633dfed274875bd4178be69457bc99737
font_01_sfnt_off000151ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EC 20900 bytes
SHA-256: cc4e7c5a29f9285bd0f4decce132d79b92a50ccaec8d46d72fd098628fccd606
font_02_sfnt_off0001864e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1