Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6afafa1ae07055…

MALICIOUS

PDF

82.6 KB Created: 2021-07-15 10:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c75c9c41ad1e72d427d0eb6744fe91f5 SHA-1: f815a74ea19475a897342cb3867f2893b02630a6 SHA-256: 5b6afafa1ae0705575b1d478217f6a0826b42faf6cf86fa45d1909bc333adeda
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns suggest it is designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0ffa9024---loluk.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c594e1d5c1e625df5f39d7f5eb223fb5/22008544707.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dv1mlok69rtgs0orf7c2qegrg5/44029129878.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a028a231bfa---jibomelojevax.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/27236c09703d4a06491520bbd00a51da/bekenadomadejelejadutanow.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b098f61c84a17cbabd4495601f5dfe75/6433750502.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0467bb54f---fedagukarozunavakorujawur.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mejixiwalovuwazupubopibip.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9d83925aafdf177a4722362eee80fc3/guranu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/756e190be0d9094a21871b4e996c3c54/wakowasumefuzux.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1e7a5c0f---xivorobuweru.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/43ffee686dda1efdff4f7999eadbb122/61475467498.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b5141a36074b76f9198b1ac839ebb79c/pitevemaginerewutitupo.pdfIn PDF document text
    • https://windsbs.biz/files/file/98920163097.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/53620822e5ff8a5d6261911b2fefb297/votelubojofevoxokale.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/30166407475.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/22354560897.pdfIn PDF document text
    • http://remobudostol.pl/pliki/52189542695.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/fusomiwoworunarix.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badb08ec5c9---fotezozovolotek.pdfIn PDF document text
    • http://cristalensi.com/public/File/dutilajetovukuzukowo.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/redorozesi.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/vatekikowobadimix.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507185326195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=all+i+ever+need+chordsPDF 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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 18156 bytes
SHA-256: e7069678b953c1fc307a3ba8b70d48a3633b3a5bcf4621a5e19931f66d10bbbe
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 10256 bytes
SHA-256: 8baee4226f76ff9a4e6cf56b35beb219cffd30fb42a18e8674920edd62f00b20
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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