Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab0f8d4dab66935…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 14:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5630e9b70599af2dfacba5c3e0ece210 SHA-1: 17c9c82e4bdf8db1d9eaae3a78f9ce9c6e1a83f2 SHA-256: 5ab0f8d4dab6693520f315a762598b43587ce5489eabfb05fef95272c2ed627a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for malicious purposes. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this behavior. The ClamAV detection and ML classifier further support its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130947e87f15---tixijupag.pdf In PDF document text
    • https://0900107678.com/upload/file/nopofedugawokogituwopag.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3a21c8d9---48640606536.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/26121097574.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/jejowipobonibi.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/nebotolejikanamutukib.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///86919490079.pdfIn PDF document text
    • http://signauction.net/userfiles/file/20563562271.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gaforeg.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210907102931_cnrehr.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/wugujukamebewut.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/72017401741.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gexopajejipivipevadidav.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/disewabekapodowuzeben.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kunozusagokewiju.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e294d88c46aa7f1a46156a829a94450f/48480211048.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/gobekirovexa.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/83106404334.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff488d7f0---kibunibuluwekiwob.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89410057466.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kuxepomitunibipure.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133539944f17---91532017372.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/78448121861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=javascript+download+pdf+ajaxPDF 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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17920 bytes
SHA-256: a2e9ef435db571571b16651e7980a28f038582d40f65e5847b66f3bb8bf00077
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10856 bytes
SHA-256: ac76b1f7e44b9c42c41833083f5cc4dfddec97f5b8a1e88df6f66698cc8a4e8b

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