Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b3999b2f677360…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 21:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5968745305804f0552096f6637de351 SHA-1: 8c3b522c2499d5db6ffc7dd52d07ad48dc52e626 SHA-256: d0b3999b2f6773609be32f68b010e6f049937eb3988a1768ccb42e5d380f4755
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synthecinter.com/userfiles/files/62468790384.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a870211ef3f---69432308603.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4016a292d264362efe7a5b42191cdbe7/79680591066.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/topadowegezapesejezosit.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/16074300205.pdfIn PDF document text
    • http://dentali.cz/files/files/rigifuzipunezozerimekix.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd12496b3b---muzaletubefesepesakono.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wofidewotiwabizavuzaxudat.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lkha1fdcop53t6lobph21uo57d/meburumekixidinumu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mirokabezewemukowo.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/fesofazasamile.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9d7700a1---1332388315.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wituxeruronezopikuxatelow.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2b43d581---58900579253.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/kodenonewunuku.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2fd67428---gajeji.pdfIn PDF document text
    • http://ge-mak.com/files/88870377721.pdfIn PDF document text
    • https://lecachet.fr/docs/files/jukisizixajabokuvefe.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/22035968785.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/lezavalodanidiwujaresew.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/suzivexeraxixososob.pdfIn PDF document text
    • http://aps-mes.com/files/file/ziladevotafezikopaw.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/vodik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sweet+potato+diet+book+pdfPDF 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 17184 bytes
SHA-256: f0d184e1b0e3fa91da685653f85e9cacb6b7e2272420a9e97b18d0ffee170595
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 10468 bytes
SHA-256: 2b30126e78755a789b77d46bf0c0e357519e13c565a7b0a2af2f8e24a8bd4ead

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