Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc4f8cb38eb956…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccb575b91cc0dc0609cae633c70a2397 SHA-1: f27757405f9e963e5d2b1f2e7d68acd0e21340cd SHA-256: 88bc4f8cb38eb956c8b599043e6109748bd9ff39dcb0c67465667a06831be9b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to attract traffic and potentially distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=renewable+energy+best+book+pdf PDF link annotation
    • http://longvu.vn/Images_upload/files/gubafidise.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/pinumikuwukakobenejap.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/95344476543.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kh2equ2p2k9adfpjfo6fcvoerm/wuvelipetivopisedejuw.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/xewuma.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lajojuvape.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5369d7a30883ad6f561813babc577b6/dalid.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c1651ceb---tabokenuzepexube.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/60188824411.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/bavomobogirulalefojug.pdfIn PDF document text
    • https://tavio.ru/files/file/27919457181.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/65497296958.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c1b8d2da26c---fezinedojibevu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/takuwefurolidubuzotaba.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0fk4hup5phng57mpp1sipeviof/gidasenijijoxop.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/25160582040.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/12328846236.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/f46cnboan9dqrceuepk9gbtqog/kerolalowatuvu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/shvuqmjdrnhdk575rnlu71ksbf/xajoverurewida.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/topewuwul.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/0s1bag49ui9o0pv3768r9h4kk2/dodidewav.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c1e9f3b8---92914779484.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/89975135310.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30808615800.pdfIn PDF document text
    • https://viehomes.com/upload/files/borujuzoxiledipupaxe.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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 11056 bytes
SHA-256: 83d702868eecc00d32152ecee150f1d499af0f4c8e9ab35f9da4f2911c2e9e13
font_01_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16336 bytes
SHA-256: 05b87b8f763e09642a8dca7a49e0ed4702da846c08e8cbe0d2dd11c92586c4d1
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.