Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f999d214419ea58…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 08:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4749faddcf5ec15fd766a9ae17c5c97f SHA-1: 05bc3436e2fefeedcd61c98af2cb6a2dab0830ef SHA-256: 9f999d214419ea58dafc937e25927cd5a53c96640895de86bb2298c81faa3c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to lead users to compromised or disposable hosting sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=movie+hd+for+tv PDF link annotation
    • http://azseal.net/uploads/userfiles/file/67652084450.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/41865595380.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/dufibawuz.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45208761667.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/pabupowiwikewu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/78802234810.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vigiwiwifosibapu.pdfIn PDF document text
    • http://rhondachem.com/d/files/gulovafijaxotam.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/46968928218.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/jesajimobinamujadokadema.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fd20bc11---jimevogimafavofolagesobiw.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ef0b16f---6700172115.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/zusamege.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-15/20210915154804652453.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/zudotomurufibojor.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/55723978612.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614162bd5a265---pubibom.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/28069843097.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/47124276990.pdfIn PDF document text
    • https://loctra.net/userfiles/file/95715303345.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/wedekisobozaxogisefeja.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/37600277361.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4307f0406---6419284503.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japadalozolu.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 10032 bytes
SHA-256: 67d71b610db68f324edc1f7dacf534a66c9863f6a0867452f1c9cb145bc705c1
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 14772 bytes
SHA-256: 120851c409719eec6a417ec05ae20a509e3858c3cdc601d391089833f2601618

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