Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc91e7a8ec6d04f…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 16:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2f616e70e496a3abcc33a14621ac7d5 SHA-1: 3f87cf3e58c3a79154d5a4c1b0b1c74c0b31fbda SHA-256: 4cc91e7a8ec6d04f177e75c9aed637763169ca00ea3242b347ccc31926510d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=five+point+someone+story PDF link annotation
    • https://canionglobal.com/FCKeditor/file/44166712892.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/bedoluromakakij.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/82530078664.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/59181951657.pdfIn PDF document text
    • http://watch62.ru/files/files/gapales.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/maxososabafaxaxip.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/depebamaxat.pdfIn PDF document text
    • http://dalaichau.com/files/zisijidesa.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/gadepatukofexavikazuviwus.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/kovexa.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizijiguverefuvosojiwemo.pdfIn PDF document text
    • https://ysh.my/userfiles/file/45542059676.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/59c82ec7dbc670eb1ee36475d032b0db/megikiba.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/13844325826.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/sabon.pdfIn PDF document text
    • http://skorepka15.cz/UserFiles/file/revad.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/61938913171.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lanijezosuxenos.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153bff06c7e4---nebutadavo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3d84e3f7---9969040309.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/23026568135.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/98426206761.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109220245552276.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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 10364 bytes
SHA-256: a530fb30610b0036585512227adbf19efa817edd6ce6a125e23b50224748a5ad
font_01_sfnt_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 14556 bytes
SHA-256: aaeabc8e79bb06b20ad6b294d2355e8f190a57355912b3f9323f369bd5156455
font_02_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1