Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f9a070580f42b3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 17:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73f2ab0fdd9f44403605a19a8b7bd80a SHA-1: 9ea31c0a0fe5a045407881f96213601e21a67bdc SHA-256: b7f9a070580f42b39be72b5962fef7fe061f579506ccd76151d2569e9b2270a3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://crewmak.ru/uplcv?utm_term=pen+vasiya+manthiram+tamil+pdf PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3577860e---jotilujitugutud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bf1eqem5n5j2s23elv0htd4d36/74271141120.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/rb64g5766bbknrvvrb4d9erb6j/91734854692.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/pipirajarukenotateluna.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2da642be68116cf50cf994aa6edf68d3/wotebuxilaxog.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a33b1d71---xuwegexirefajageziji.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/nezisapotagisugizevok.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/72688007806.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a92c4263e7d80d27fbc80bde0039a940/rukilejefonagizufux.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/lobomavuzunin.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/60822655507.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/31822087547.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tozifawexo.pdfIn PDF document text
    • http://schokozentrale.de/idata/zuxosizuzarili.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/96718971060.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/jisokebukodidox.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/jamikososa.pdfIn PDF document text
    • http://www.celso.org/download/mojopizewun.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/40971910440.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2818237d---rubumobebutuz.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-5/20210605063729617042.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098467898002---84193210525.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/56023797402.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853f3fbd1---95697480207.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9402d7a3ea7e5e6f0bb1592dea4da13a/zesafonikomulifekivutizi.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dugejujuvajatovinefavafi.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rulizejonedosasovufuxo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 10824 bytes
SHA-256: 94c894030ae313331b48a00f3c7bb5565fe9ccfbc06ef9e2f8bdc3512727af69
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 21260 bytes
SHA-256: 0fb3b232785704fa55ced9664ed2c0bed20ff8289b53c02cf1a41ad226a3d5a2
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16796 bytes
SHA-256: a2a22c27a0382cbe301992ae446b8ea56d91a6c2941f900a1cd61198da7d48ac
font_03_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1