Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7bf81f24a782fe…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 12:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: aa22ebdc49729be60b9ef667343b3390 SHA-1: c004dd2bd69fe4da898d39cd408e75e483b1c795 SHA-256: 7d7bf81f24a782fe7dabdde9b9a74e5ef4922a1d9992c3cce1b16f174aa1d690
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=how+much+to+feed+a+conure PDF link annotation
    • http://arci-mp.fr/admin/File/zumavisexugepemalopibedu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f705b1ef41d07a12db21c0cc89fcce61/zupubomofiwumimoxanazirol.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/82016857018.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/93196705158.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e06b8e573ea59e0a77d14345b52fc97/36421032801.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/buxexokadikawokuvodifum.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3i49kk4jos4knn6ahbafs7n8ge/24573238713.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ed2f3e363692beed59da7cca956d14f/tipifevufuvonajof.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67ca15e70---dobunu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f948e6df21---wewid.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/42619tvvqt56rccvud8mp9cu6b/72343867116.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/vigoroseb.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a359cd09ab4---vuwolewed.pdfIn PDF document text
    • http://kbchina.de/upload/natuvonafidobujewutena.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/100aiegvgllkp6p0k5k5hpb1j5/27587504453.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/7896385924.pdfIn PDF document text
    • http://lyshiying.com/d/files/sukoteweju.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c010333316---mafumejajiper.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/kezazetef.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/54271275590.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876d4a101d0---30184243540.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc03a6aac7---pemokotifipexux.pdfIn PDF document text
    • http://azizolace.cz/images/file/69553288037.pdfIn PDF document text
    • 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_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 17392 bytes
SHA-256: 36ed11300b9355f98882b1f3f0c199f242338a191230237262edb94d2b5562af
font_02_sfnt_off000144be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BE 10612 bytes
SHA-256: 8a8101fa39de4a8b065f88f91fc58d2c891ee3c4943b2035df5dcc012485f4b3

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