Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cf9063aa14044a…

MALICIOUS

PDF

75.0 KB Created: 2021-08-03 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf49f480108fae9af7e413077c24803e SHA-1: a975bc2f86d9d2044978da365e9ee5ccaf1fc673 SHA-256: 12cf9063aa14044a375e8e85c083b580614611a6ee272075a786d0ae2fa5eb6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to malicious content or phishing pages, likely as a secondary stage of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f9527219578---notofew.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/24112641567.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28789084157.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/suxoluzakeduke.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f596eeaf7---baxonidexawixelimofinif.pdfIn PDF document text
    • https://codecs.roimages/file/44478664997.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/115b1cc81c492ee1a3a5db149693ffff/22312925113.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/82121996238.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/buzixomavepajuzoda.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/uk9965mhfadpuv7kqbscmeuhe1/30774553402.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/81948356856.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7c5f59617---65363906847.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/91829585942.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084448e8b638---82383104737.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dozigike.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/xujowisudipojuzugit.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/60072477470.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcc18d450---19337288889.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/31758980965.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jabepurevimopikibegora.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/254d1111449d9789266846316d47cb5c/tuvagetibibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=get+taller+programPDF 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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 10272 bytes
SHA-256: 5eb6570e7c07ed9ca1d02005ee0fc37022104dc9757b7a17ebe7d28c3107a3b9
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16676 bytes
SHA-256: bb99135e0395948cb1e340d29149ebdcee003bead4ad8fcd373c3c7c6d8c8ec5
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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