Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63e856c4c4e4cf1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 20:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e707b97264afd6aa6e4ea8c98271b00 SHA-1: 7e1cc2197f891df59b7a319b1b1bd4c52b8351e9 SHA-256: f63e856c4c4e4cf16c7574d248797bd64b931592174bc97cab137fbb862f91b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://evpersoneli.net/ev-personeli/file/dinaparujafope.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/58151362426.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/35335471732.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/leror.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sajebenebeweleminoz.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nodumufelogej.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6bad5f566954b1e9ba4e602d8586986f/zojiwelizupon.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161339722742c3---67529754113.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/79728797444.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pepimaro.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908030345.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xijagakusow.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/jozibamo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/2446534335.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lokemadebixizodaji.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/fexogufovina.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78d99ca61---31848689308.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/48881418822.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/difozimiwefi.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/53498394382.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/80685892652.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/tiwebereredugoludevixoxem.pdfIn PDF document text
    • http://profstil.az/userfiles/file/fogitizofifepoduberurala.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/70839687398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+anybooks+apkPDF 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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 17976 bytes
SHA-256: 34110a08abb0fac3903455446f612c4a19c0d63dfe3770d5cb26f482443f8a75
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10332 bytes
SHA-256: 056d2c8a49b506de4deee1f91671c8ab1aaa4a979ccc20c10133b04fc9c9d16f
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1