Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb399f4ecc3f213…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 11:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7de875c620e1819da581c338dd141a6 SHA-1: 8b1b002288d14ea903fc1baffa63befc8606196d SHA-256: bdb399f4ecc3f213277a77995aa75eabb26b7784cc59641dd584ae4440c12890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or lead users to phishing pages. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=advantages+and+disadvantages+of+cluster+random+sampling+pdf PDF link annotation
    • http://beachfirebrands.com/userfiles/file/6912503071.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87c9deb80---57325256879.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/44996851520.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2a4acc2898263103bc5eace1771d392b/fuvejufofomo.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/mefuso.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/43730116870.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/9272344344.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/gamujajerurareb.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fdd7fb0f---50683147531.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/64704326331.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd661a134f---jetitoj.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/tolima.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e661ecfcc5---zutitorirekusobimet.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zozesamewubezagolalal.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210831055321_560271415.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72eab39f77ed1b49ce534075338d0961/xojezabilewogetuwowuxum.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202172353394040.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610321aa18bf3---18095517280.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7k035bsrc340c7nct98qfqgln4/49759432178.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a426806ec72063c731c9c991a9228a7/52760401253.pdfIn PDF document text
    • https://areicon.com/images/file/xomitulusar.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/nikikumore.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/67efa28835242ab9ee91db93d558eb7c/90985064922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 17200 bytes
SHA-256: ced180a8b3086178d75327639df628aa4843424a9d499c90ee38c3db99fee43f
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 11112 bytes
SHA-256: ee2cec157bd4689ea56de8667216a103601db2f0f6252d3f2dfa533edfd4090c

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