Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ba460b4c30256c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 03:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7600893ee38fca6a5767b42c02230d89 SHA-1: b3419a49339f1d8faab6eb77868fe645b3da08c2 SHA-256: f0ba460b4c30256c9cbdcfa98885667c123fe640ad1069a03c687810d30e6118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The file also includes numerous links, several of which point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antwerp-reefer-tournament.be/argt/files/fudaruvawolerebeluvem.pdf In PDF document text
    • https://blv.by/upload/editor/files/loxaborupodatinojuja.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea466cca0---vokerisoxavo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418341f117---fanapuwitimepopajagopukep.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajakekakagifedad.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65417544536.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bosep.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/80679956206.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/banepunibomedasusigep.pdfIn PDF document text
    • http://lecostationery.com/files/file/nazamujupusogokowi.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/20964589244.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/59100998175.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bf0a6cfd---xigitavuwidak.pdfIn PDF document text
    • http://fkhd.cz/data/img/11696559773.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/5880213497.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021950735171.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nupogotuxid.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/933e34443a210ab60d74a905094ba314/40370981943.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_0083EB3519561234.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/fajevoxabuwakutevelokex.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/subatemiwaputorobi.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/88847059353.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1630849757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phone+id+faker+appPDF 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 17220 bytes
SHA-256: d5622ac2bd60829083a369412035cad574c1465d95da2c7365e3e2ccc26e7fc1
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10376 bytes
SHA-256: 3d902193f9e2d276d9456124b66f7ccd82ab237ca8a3d566a075ff676ebdc98e
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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