Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c123b03b6275046…

MALICIOUS

PDF

91.2 KB Created: 2021-08-16 23:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d03cdeae7910ef4da40d47eec95f78f6 SHA-1: c38bb0e02b237ca4e80a178bda529eb95dd06153 SHA-256: 1c123b03b6275046b71e809292120e6a05c7a6d52679e4759a9d38ebf61dbec7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of these links suggests an attempt to lure users into clicking them, potentially leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e39052690---28350022149.pdf In PDF document text
    • http://u15.ch/ckfinder/userfiles/files/foxamop.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160777aaf0c767---kutuvojifanikanu.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/foxifopadatimaf.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tusapunitosuwemobori.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/827621ba23b7d1b7580ceb00ebdc0aca/10574378037.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xuzejasilu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088408df2f28---25059340578.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/2121985539.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a923c1f6f---mawifogaxibaxudisa.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/zimemisekokuvoritusureti.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/8066040554.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8edb6d74d933a3812b9a5e5547d94945/xifagijilelar.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/17846112206.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f3b23a8f---sapezaxuwewuzaverubabeza.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ede25564c6f---1576169249.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/56766649746.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajp0kbho0a85qdl1709nphbrj4/92286951908.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/newenidofufimo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/748rrbht21sums54r8h422cu71/51032329898.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/156634d9ad006ca504586962542e1632/firojizelif.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f15a05b7---49206340523.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ccd5bda7d4db3dd1011591a9c5e511de/83639276579.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gupuxego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=samsung+galaxy+tab+a7+review+australiaPDF 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_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 11064 bytes
SHA-256: 12acb3b72937914542f8265444570578c1d1a8578ce058f606f3e932b6bf64b7
font_02_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 19560 bytes
SHA-256: b0a0b0c61687fd2ccbd40b49ec0bfbc49c5d221fa3cb3a76842b064fe1b4b963