Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb8d560fc40f2bd…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 17:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1367399cfd7ab7e75200ba1457feb04e SHA-1: 5cff489b48343643bfc140bd82c4ae80bcb4c5ee SHA-256: feb8d560fc40f2bd5921e8075731a975a9752d0681fc98f6bfec1b40125f7d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad900b6ee---begibutibimibotisuf.pdf In PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/3519181506.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o5vlo7cfhu0argl9a1uruc7mq6/depelimopetemotefoti.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/suxunebowatikodoxom.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/38355311807.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/anm31n8abjpb87b32er8bu0u51/vefotobajuwazo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p7am5epoea2tv7j5nuhtfd82kl/58516385435.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e205960a4---25380151674.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ccaaa7edc4e5d97631bf844f888576f8/86639876813.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/926003c4dd8b21a64c0d94897bfbaeff/xupitilokuxegogove.pdfIn PDF document text
    • http://schokobrunnen.com/idata/xabojanabutafozubano.pdfIn PDF document text
    • http://uci.ir/userfiles/file/25139825436.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9a784ff322562ad5038015c2adfc017d/19804032497.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0fb983ca---sonesarilagel.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8d161b00d915d90623b1f9b96986a3e7/sifazusow.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae2eb5998---xafijelage.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tebolu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e5c9ba6f5---xesinivagivekosuno.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sfh1dsbos0h0kb4erka0h698q3/dasopadexunefed.pdfIn PDF document text
    • https://tmtteks.com/files/bebopejidegosedenitab.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/junotisisonevumem.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255d84d87f7---59434394695.pdfIn PDF document text
    • http://huefpdf.org/upload/file/29610625327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=preeclampsia+guidelines+2017+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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 18032 bytes
SHA-256: 82aef294b71fce21129e916598548a4a36335c2d122b95a3e59df727430a851b
font_01_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 11188 bytes
SHA-256: c5d60a652cb6ee6bd0665e4f1d731aedef8448143ac73d47537005205e8b9d53
font_02_sfnt_off00013648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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