Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6bd5ff0ee57603…

MALICIOUS

PDF

83.8 KB Created: 2021-10-05 23:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adeae0f5eb724481e8ffd0c863bce853 SHA-1: f8828eaa09b07ab9dfaa6073e41a659923006431 SHA-256: 4c6bd5ff0ee5760338bb836362dd366eeb74e49a7e1e2884d258be337bf35669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=critique+of+aesthetic+judgment PDF link annotation
    • http://tt-ural.su/admin/ckfinder/userfiles/files/79195433182.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/26883873973.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/muteravanozimebikaxoseseb.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/lefuponoxexilokukesawuw.pdfIn PDF document text
    • http://membranekeyboard.de/_data/file/venilisutenod.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16152f61ed52da---17120678617.pdfIn PDF document text
    • http://tipiland.net/upload/file/kosobesis.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/25787730915.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210909_210741.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca3a6c9c5---romixunumipisana.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/2271557146.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/basunorolewibuvutiwid.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/85699065669.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/jetatoxazobamofid.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/lopukosodebunevexutegiwe.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/5855986410.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161424f65ac155---sizas.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20211005035644.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/94846762402.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-28/20210928002229105197.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bidobiwoxok.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 18472 bytes
SHA-256: d4dfc37ada993889c9b4cf1ffcd61ffac4e590903f9fff48df1953dc892c756f
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 11284 bytes
SHA-256: 80e28537051fc48a60992638d3baa6f4f6c30c645ae051e1dcb40aed44c82e97
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1