Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55bb6734337bf50…

MALICIOUS

PDF

96.4 KB Created: 2021-08-06 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26890ffe1d11e027aefb87bd7281c8d7 SHA-1: b0a7159a83541bcff4bb23c04fd14562591cd854 SHA-256: c55bb6734337bf50b8e5fe061650684fceaf295347869fdae197a163da925a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://futurepoolandspa.com/ckfinder/userfiles/files/33159937699.pdf In PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/68567001727.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/begijufijoroxaxudosirup.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b27dba11---24166052542.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/gomajorizinig.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xapopuz.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jr4oq0aqqs1rg702opp26biqag/91184764306.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/fawazigumolatafekawirada.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nibuvamifinudelitubib.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/22683420574.pdfIn PDF document text
    • http://hnspkjx.com/d/files/10040911258.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160970d16d12e4---90038617471.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8m2sv05jd8mk5aog8957d2iu6/luzipolerukiwopozabega.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/watojal.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5e6a5c3706131eacf1c3c5b16f1494c5/futakepimimigivugiwilewod.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/84dkgeethd7doeog73378s2r67/89468481048.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/jopikoz.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dexijeralo.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/ruzatuzipenefasuwakonulij.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ed73c1ea500c531311f44f1737ac8a29/pogujasobosusokagafataka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=revert+last+commit+github+remotePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8dfa60ecda0b2ba77427e466887cf476/xutewazawolujozavadoji.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_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10924 bytes
SHA-256: ead2c3ba98843270664968f64f6f13ebb59b8043366ebe2d8465f4540cf7fcb4
font_01_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 17408 bytes
SHA-256: f3627c4122f86a6a9a45f71e201e1e30ddf57e84c2f79295decb365d404ecee3
font_02_sfnt_off00015baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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