Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa31847b91c7528b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 13:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc0ded29e2968f82974924942d04c0e9 SHA-1: fe552a2cf41acb9186a398b9a4e3b2e519166b0a SHA-256: aa31847b91c7528b343dd176ed1881a70abcd167b9e7e888fe79b09bf9988ba3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://droneducational.com/admin/userfiles/file/xotenajedorogilonagiduto.pdf In PDF document text
    • http://haiphongcontest.com/images/files/digutazon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jtdt8gjfl9fr3b0pt5ebbhb7v8/98360927920.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/28700922086.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/76910470981.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lugira.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/munfoi49j97d5013qqkh8n0f2k/niwatugokilexefe.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/45130716619.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/naperefujepofosenigume.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sigurewutiguv.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xumolizasenatamex.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/89293972040.pdfIn PDF document text
    • http://pactolous.hu/upload/file/lezawixenimigagewuwokixid.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161492165142ce---3025443450.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nexedizejibug.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/jarexudurudemiwab.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/16321299070.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/posemikuribes.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bld7ha43d1oeo9qjlqgp9hknh6/vusujizugumefinojerani.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2b4b26f3---76707836294.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/4141382042.pdfIn PDF document text
    • http://ruresept.ru/files/file/41874887116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tom+run+game+download+apkPDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 10620 bytes
SHA-256: a628080f86901a4013c3c377c453d40c808be4705a2585912748161eabc77afa
font_01_sfnt_off0000ca99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16876 bytes
SHA-256: b3388d70e6d1542fb1121790ec66d8bc049d51c5f06493435cfbfa845b6dfbcd

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