Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d7ef730671a050…

MALICIOUS

PDF

96.0 KB Created: 2021-08-14 11:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0faa2d3ab973ae657c1aa849a737a88 SHA-1: 2642e7fe8c2cf325c352aaab51fbf2a80b06c7b1 SHA-256: 99d7ef730671a050cf97dd37bd23def876d93b80f23fd9796c9b4378af01d992
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725ac9dcbc7---wuwimutuduwetavarote.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7c0a10e7---tobaz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2r0t5f06afg304siuheg4gms4d/sexozotogodixufiwavew.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/40679442013.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/11872877994.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/kanudineru.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcfa165df---vaniwenileliguzeronuru.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xenokomesik.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8ebe0e486adce5127cbc3210595f5adf/vexonorekulib.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bab428708---12988428040.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/woleni.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5822c7065---xonanizokagedenuzub.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607623da9b9f2---73923305219.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b11c2b0c7---gekinatojav.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dogawejo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a9484b3a---banufanoderunuga.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/142f768ac2c6441ea965d5eb5e1835bd/20778096353.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k3c672lehcb9lr235bo9tsl17k/80441717876.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/mafokititatamivaxo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kezulevogigaj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e453b03e4---porumanopuxi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3b123fc74457eae47ef889e1cb1ea92e/rarigil.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/23288532862.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/punejulasasarebowevozafur.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fbcj633aqte547ds9qagnh2qi7/86608009823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tucker+carlson+net+worth+salaryPDF 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_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 17848 bytes
SHA-256: e05de900d6ea83d51eeff8f03bfe1a75f58f137785acb11b3f00ed013ae43d41
font_01_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 10588 bytes
SHA-256: 164b8f983b15bdc18abbf0f7af73f7005a80999d1c5b7cd060d6134693f021d4
font_02_sfnt_off000158cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1