Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd888d65efd2208a…

MALICIOUS

PDF

80.4 KB Created: 2021-07-13 10:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4599d3bfc97e6a7a374738cd90e545aa SHA-1: 9fc99bc445cfecdce02c7c35bbd2acc44ba6a082 SHA-256: fd888d65efd2208ac86e5bc12d88c263b45e9e4aa6425babc65923700ded541b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0c02e67312f522024ae3bd48778e0ea5/bopamegakimote.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210602234306.pdf
    • https://lanjutpt1.com/contents//files/xizisamax.pdf
    • http://digifast.cz/userfiles/46542991305.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca9775ff2---kotinime.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/19609651873.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a81ea966f---dijugewuvojamu.pdf
    • https://harkakotony.hu/UserFiles/file/muziritorolujimatu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ml1blqommckm09utvmnjdnbear/kinevaloda.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca41bfd14---fowowaxokevetubutepon.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdf
    • http://birnagarcollege.in/userfiles/file/62596886345.pdf
    • http://spiregene.com/image/files/20210708_032144.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8ef2737---befudoxafuripeduv.pdf
    • https://viboot.com/ckfinder/userfiles/files/nigupotu.pdf
    • https://vildmarksjagt.dk/userfiles/file/xezegonemakexulaxedi.pdf
    • http://kovacsoltvaskerites.hu/images/file/sevaxu.pdf
    • https://muratay.nl/userfiles/file/lotewatatosagur.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa276487c---80586078730.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a845c98b0d---wetexivavokutotimigiguj.pdf
    • https://menu2uplus.com/images/file/91875966686.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4b93b2d62767d20a748d90bcf2502f08/negadefivevezilonaketoxav.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9febfb75---94495418357.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a69cbcced---rosofomatinulevetulawupad.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9700450d2---26512369032.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+free+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
font_01_sfnt_off0000eee9.bin
584daa26c69bebd54901a434558d75d0e775fb8e522a12dc112353355e2e5a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16932 bytes
font_02_sfnt_off00011ae2.bin
7b638e3c8e91024d8c92b36444454f491465e7964f44fa09e02e0f265fc451be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 10884 bytes