Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a09572eb144488…

MALICIOUS

PDF

124.2 KB Created: 2021-09-17 04:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ad293dea30fe3b09eb0bd53a2964259 SHA-1: 0b35f7e62f7af1f15a9a4d3dc36aa83d4e1db7c7 SHA-256: 58a09572eb1444887119ca339aaea38384af230178c1305c8b0dfc9b87e2c5c0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through deceptive content and redirecting them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://assotechne.eu/userfiles/files/84191203559.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7d62bdc6b1711f4d34d50b39df1c3013/sitepurubosit.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0prk12pkbk3o6j50v4o0lciotf/vugamotewiziga.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51046035345.pdfIn PDF document text
    • http://nktrading.qa/file/files/bivufuzujorimefalo.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631089583.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/73db90caffa454bb54c649f037763800/dulirumozogimutuguxuki.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/98578357674.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/1364978156.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wujuliwugunewelidofarewe.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/mobomuvobinikuv.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/91978476673.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/pamasular.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/joguxo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0fa2b532---kituvom.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/49267413490.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/66869325952.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/24679834253.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/nijumalugozobi.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/14322829405.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/subanox.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211e9358c9---12117293466.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfdc3517---73946524221.pdfIn PDF document text
    • http://happy-land.hu/editor_up/disidogolu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/3ea1f914a122d7d03aefe6bbf4c896e5.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3e49542c5a8609fc6560d20a89162f7f/tatefulala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=warhammer+40k+assembly+instructions+pdfPDF 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_off00017576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17576 22200 bytes
SHA-256: 4539879c80548266334095ae6436a58338832f0d68654773e73c7fd73f21f539
font_01_sfnt_off0001af7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7D 11524 bytes
SHA-256: 4b5a34c85ad7cf28b43a9d5b42d211aa0f66e011030618acba40dfaa821c2cd1
font_02_sfnt_off0001ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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