Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe323e70557c15b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 22:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4212cab1b3c8abf9d79fd179a8241039 SHA-1: b8f4b1605f6116e1edea166a6da5bd53f8219784 SHA-256: bfe323e70557c15b2c87e97cf53a8aa9282fd9428d2c890aea63c46664b9503e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://stephan-kratt.de/data/reiterhof/userfiles/file/mizilotaterubolejimeg.pdf In PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/sediren.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/65915606103.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u1vcvlb5l47r0telptg3jdnq2k/98519842568.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/ximufedimifevetelofawi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pubidavikoboronesiga.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78680619134.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130abcdaf8f7---wirujudeb.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/lenetabak.pdfIn PDF document text
    • http://jawarakreasi.com/file/wapomibudanesagibuxi.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/76587858127.pdfIn PDF document text
    • http://rafaelokazakov.com/file/peguwokexipisadujoluz.pdfIn PDF document text
    • http://canadanur.com/resimler/files/87503972189.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/83375137937.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/demumutotulomo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e7aa8215bdaa2cf58e9359661dc628e1/nikupunimisusetiv.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rotibakigidajoxokisugu.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/sazepajozuwaji.pdfIn PDF document text
    • https://viettrungson.com/media/Files/23603392491.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/nurefif.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/61920235933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interview+answers+problem+solvingPDF 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 15892 bytes
SHA-256: 326f662c883a78a14fc86adc96106a61744dd840d7b7396c90b899db554cff90
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10840 bytes
SHA-256: 44f5007efc3e5c710d12eb60578ae387da322dd65ed6c6c4c6ca2b2051c9440a