Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c6eaa1aaaf589b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b9e53bbed311a4280726f2434758c64 SHA-1: fdc36011c9e8750e7dc70d1f866aa7da1be42202 SHA-256: 89c6eaa1aaaf589bd1ed13744d674b02dc24edb6b5689a2373523285d1e6f4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=taps+trumpet+pdf PDF link annotation
    • https://bishopsalamatkhokhar.org/userfiles/file/87256010445.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nopiruguvogibofubul.pdfIn PDF document text
    • https://cooperspick.com/files/62940890043.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c2dbb3b6---lazuxexanezimopewepe.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ba79bc03---82966574104.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/37974747841.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8aa4495d458e770620558c2c11326b90/39149622534.pdfIn PDF document text
    • http://cabini.it/userfiles/files/4291763093.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t3imuesfeubh08d0n2s8rooh3o/4084859223.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5f128d17a---jetatixoriferikok.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/runabaluxejelazijema.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/81f129f93c12c85a9a507c945100e74b/xiladeget.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab817bdf---kamopew.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021631251443404.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/86549900449.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/412ft5ku36h7hgkgu0m51kd7f4/39502082255.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/34285184954.pdfIn PDF document text
    • http://ekotronic.eu/files/file/58610690177.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/72742171687.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/gubiv.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210824074427_l2xcsg.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/88819620533.pdfIn PDF document text
    • 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_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 17512 bytes
SHA-256: 21a182efc21069db4862d9489d855b639a38b52df336bb58daf83baeeb516298
font_01_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 10360 bytes
SHA-256: 99341b2292197ec557e4ce40bc984b5f21cccca0d7803a5e806ee764af9d5ff6

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