Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4447b061779b53d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 14:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8f1f986352bf30681ddf4012381a956 SHA-1: 7a5867ac2027a3f75695f88639782e98e4f92917 SHA-256: b4447b061779b53dc816319230bd95fdebcc1086269111aea0ac567af7aca12d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4513e1b4---31650923434.pdf In PDF document text
    • http://mediedil.eu/userfiles/files/jimimesuroxixudatebeto.pdfIn PDF document text
    • https://photofetimages.com/nipaxilip.pdfIn PDF document text
    • https://pokereshop.cz/data/file/manasonubevuvarikefaje.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xikar.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/30137949212.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/poxizidiselutizuniwepi.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210915222146.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55663632059.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/81157767342.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/44206833368.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/74311530118.pdfIn PDF document text
    • http://capri.lt/userfiles/files/megatikenon.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/31104381477.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/kadok.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/winunaxe.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bugugegifi.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/jijitozu.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/44371741715.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xokojo.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/suzumod.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/18746796527.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/luwejujogameguzazalebun.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/74761751112.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///verodorofanatutodenizu.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/66641241831.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135176ce0ad2---kudepulu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2b7d77ee---8221861970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hitman%27s+bodyguard+watchPDF 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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 17572 bytes
SHA-256: 0dd2fff6c74eac84d96ec18ded9ab2a71ae70372b34081bd116b9855b35fd6ab
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11104 bytes
SHA-256: 6666d51018fae07961a22b919e7871ff0f59a6875102e95708c6bdc2b25c405c
font_02_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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