Malicious PDF — malware analysis report

Static analysis result for SHA-256 54294aa1341c39db…

MALICIOUS

PDF

103.5 KB Created: 2021-08-11 22:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f43dd85f23fca9b02564d441fef51d SHA-1: 5f0675832fa7f4a803637fafd105b41b75d49d07 SHA-256: 54294aa1341c39dbf5b7155632cc8b286259ee14adf27752c93ec4ddc9633d37
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting is a common tactic for evading detection and directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9488

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63a4c25be92c98c7919a6546ffb30f71/lamirinitibukezagosegun.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/003togi9unf3klq3kddvdnj6m0/nuwakafiwepiwawer.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/fumikofipiwozewu.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/zitimub.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/desopimamaw.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0b44d7f774d0326d1452ff196c22bf40/kugilag.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/difoboweninijoje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a95754e6f---91011965892.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/lugibafud.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/guwadenezuxazuwazozaporul.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jl7fflp7r08kqjn0o38qhcapqe/jodefamunak.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/33974868733.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e7ae380fc---43652313019.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062318162470554.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/19339612122.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210615171648.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/ridabejumaxazu.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/bupez.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/29513108270.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ig3u5lsj4t9to67mlav2sjfkib/25992178915.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bexukevasiwaterogezavofu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4702eda6---foribomesivefili.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c174d8c10---sikugalumol.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/77295638320.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d404098d9---8564739947.pdfIn PDF document text
    • http://markone-tools.com/upload/files/63858329714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hajimete+koi+wo+shita+hi+ni+yomu+hanashi+endingPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 4844 bytes
SHA-256: db9b026186b73f789935515bd13e83bcb029d7c34cd73763da868087bcdf34d9
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 11060 bytes
SHA-256: 0d82cea0f0ee6da011f84c057f5dcdeafebff86e9e1c1ebd0fd246b1504a5f0f
font_03_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 27540 bytes
SHA-256: 5c5d7a1012af069073fbc1251fca7a38a96c6212deefe7d2fca56a90982fd369
font_04_sfnt_off0001759c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1759C 16724 bytes
SHA-256: 737bc0966443b036094d466c7456a48e8e3da68f75248d3475fe7d3daf07efa6

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