Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67971e843573d3e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 03:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40a0482fec10b4db188b8eabbb97bc5d SHA-1: 48555ed10852daf044fc69f2df17033e362ab365 SHA-256: f67971e843573d3edea3aa7802894fed6209f60587d9a6bcc4aa816822580a5f
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 a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--or3bi2da319p.com/upload/fckeditor/file/tavetezivosumezabo.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa08a8074---48375597704.pdfIn PDF document text
    • http://usa-ex.com/4682913609.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4d606e167d97f977cf52bd3d872dbee8/sodifo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dg36d2g41eif9momeqcj7481o2/jovotiteki.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xagirokejixuzotomebumer.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qfdqa9l4t02nu0uu0pafccg71k/zafifizejigovuzabejose.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/vusizomomulawirob.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797cfdb9c1e---somevugisibawodetobutuwew.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/zafigagagisekuvupob.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f9370f045---16544608650.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qnlks7f3bl1mc4u089tdi3jlsl/vuzipotelawukikifofimi.pdfIn PDF document text
    • https://rajaunited.com/contents//files/76804702474.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba31b0864---34344629141.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sasevajatemudubimo.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/luwelow.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/947fc0fdb5ca6dc0c66cf7367b23bcf7/4478089147.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/musilewuvomamo.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/wakagexoda.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84827b63e---sanizotavasimalogigawemu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf68752a7be---44478418965.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d7f212b67e538d1aa105ed7c6c77f4b5/goxuvomixinukamevawuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=saturated+and+unsaturated+solution+definitionPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/46a4285dd565b109d52086753291f9fa/68059947537.pdfIn PDF document text
    • 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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10520 bytes
SHA-256: 21e66d30164c27e6f190f4769107c1d099ce498d4ce333017cfbe91b51341f35
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 16944 bytes
SHA-256: 85daf2d31a97b543872f5f9f177316b119ca7931df111f666f8cee23030a5522
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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