Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ee2a15903e812e…

MALICIOUS

PDF

82.5 KB Created: 2021-07-05 00:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe63603ab3e7b50bda78b16e5f887c28 SHA-1: 9716ea4456baf53b0e0f9dba99244910f52d64cf SHA-256: 83ee2a15903e812e0cadd8f33ead0fca43bbb003cb9aa96670d2873519e12be1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://amd-export.com/site/upload/file/58808075421.pdf In PDF document text
    • https://securityguardsupply.com/php/uploads/file/sibolujivovoga.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/10c358fb1ba29d214b9aae04eb863dbb/diwemazavopebokexaruva.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f88300a25---vojumaluwiketuwoz.pdfIn PDF document text
    • http://apvn.info/userfiles/file/sidinuzamizezepizinateno.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d7694d4d1aa---95637760815.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/4458292179.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/36640426028.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e7675add72b0759eec6451650dd5bfe/gederiliwa.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/sawijetedufodesowo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e39e72438c84ac99886eaadcbd88fab9/60236117762.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/93ded8cd92a681687ea55a4ba991534d/79920293878.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/vavenobukuguvixub.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8406422467---voxubetulolupawuz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b431bb1d---japamafokegusefunijeletos.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/wanesafimuledan.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/59dc81fc59abc3983f40f51730a8409c/dutulivakiwodezu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1228c9034---nogigusovubofebinaruvi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e4gkqj10ajvqbdfff0p94nuda5/21168613962.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/14504677059.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nabezewavozof.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/4629776498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stuff+that+starts+with+cPDF 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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 17440 bytes
SHA-256: 4410badaec1b0bb7ee29fe1bfdc500fa667963051ff5abb964fa491eaa9627fc
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 10292 bytes
SHA-256: e995f74cec5eeb3499fc67e3ccaa09577116cb3482eba176bd1734c9fba5614b
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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