Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9c72c1ca572f74…

MALICIOUS

PDF

90.1 KB Created: 2021-08-10 15:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 07393f749152d29520d635fd786c5a15 SHA-1: 90ce32857ead6bb411e79c2716164ef351f417e6 SHA-256: 1a9c72c1ca572f74ff47ba99ecf5ec801de8f7419ac5c16ba23bbd141178facc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links to potentially compromised WordPress upload storage and a link farm on disposable hosting further supports a phishing or malware distribution vector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://discovercefalu.com/_data/images/file/zowavevevawe.pdf In PDF document text
    • https://moolans.com/uploads/files/34852621908.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25297251643.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16626146490.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/20508035724.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/85486405281.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/dgced2ujdngfatoaq8rra0qu2b/48116813483.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3809249f54---15679191082.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/19599773556.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4ef53d4211d3c4b4aae6e2c15a30e990/46534775131.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/31374188704.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/bilamekekilidise.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32806068702.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ri1i6ld9i135211cqkn4rskai4/24114010024.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rubelovufagubibogiguze.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad89c142a---89243778280.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c80b0095---39598043578.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f9558d50---repowo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/15114815111.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1aeaadb34fddb327e9e610c8cd35406c/tawobeledogo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/zetivak.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/fugurasuvavodisubogawevi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a045cd530d53eb9e47d79d92341d3dc5/pagejubixelulujal.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/krsi102t993o67c9ckd0a33m0p/94480029923.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b9db9bec973fff3ebdd99041a73bb86f/fuwetaboniwawiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+fire+protection+better+than+projectile+protectionPDF 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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18476 bytes
SHA-256: 630244ddbe50b512840bf8caf2442da1e1d481610d8bb93f96dde3819549af2b
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 10800 bytes
SHA-256: 3fcf2c2dffe674c6da216b62b38c0046475830eb5ef7377bdf45feacd133de52