Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0fe99670557cbc…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a7e0a580383deb1a6ae316c08413cc03 SHA-1: cbe077843062be824fa6e4db7cfbfe101fe99543 SHA-256: ae0fe99670557cbcc3b4822994d13d50f28a2e87c99234328f58e6ae5ed05167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://eyetracking.pl/userfiles/file/36574165459.pdf In PDF document text
    • https://doganagolosa.it/file/42799775859.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/70635807443.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0cedb13---povojebij.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/93283622050.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mobimewoxod.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/19253513942.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7513c6ee---mubenevuk.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/dexedulokemupegabas.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ccc16c10ce2aaeefb843a898bd4fe5a2/10751816137.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/gakinenujopuxemifotiku.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6660a67b6---51887797684.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/relinimafagidafexujufid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jasozunesuxupobopowekir.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79cc5f9d4---78464631309.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2h9482dlv64gooror2bmefa0ju/dewidajepudumo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6742016e2---kadifawujegupuk.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869e3a26a8---10153251613.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/viwofemasolivar.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25u9pk2g142i0325mk647nu933/74321925159.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/33896368028.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/dotesemulen.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/7343831209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=discord+server+rules+copy+and+pastePDF 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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10788 bytes
SHA-256: 79e308e54f99eb7ba186884298f19f5b189f04776efd91edd2e6713563060f5b
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 18596 bytes
SHA-256: be9f11b2cb441f10f6060b8f3f264463a70c24d94fdce561c53994cabc3ae7c4