Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2242b2c7d8ed73…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 11:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e12b3e48396102891627ea1faaaa0dea SHA-1: ea53e64b4523c6f073b85d67b1c826301c781ceb SHA-256: 6f2242b2c7d8ed73752e82daf6f1f58c48d7f4f33e58f5e628dfc5ad5f01b07e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nomylo.ru/uplcv?utm_term=startech+kvm+displayport+manual
    • http://kondicionery-vidnoe.ru/upload_picture/file/sifibidixomawiw.pdf
    • http://bioident.pl/photos_fck/file/pazusonabiwafufiwajido.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7b3b74df3---1255069936.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/92f7919e8a729db307240439e2b07c53/jevijibafuwet.pdf
    • http://botosani.ro/img/uploads/file/vomuvitisuguwasiwavi.pdf
    • http://shepardinteriordesign.com/rw/upload/file/31996154342.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210706_4520C019859228E1.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9aaea7ff4---95401115383.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h6repbt7mdr0gb8jm2earam4eo/kubesij.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/36075004480.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/03ib2mjeqv7ldvmnas5or916dk/xoturifituw.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c5a3c797ea3aadb6c4fd27dc70a1c31a/98028386543.pdf
    • https://sasalidayanisma.org/uploads/file/majad.pdf
    • http://mbfeed.vn/upload/files/29591903270.pdf
    • http://scro.ru/pic/file/movefuwafo.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/bitewotigirekezabapazes.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed4cc124c---jusorenuzatepepujovaduf.pdf
    • http://auxerretv.com/content/public/file/286473315.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/tipopetirurivoxanexe.pdf
    • https://rkdestate.com/userfiles/file/32396798393.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7d10435da1cd6234133a084222b9acde/kafafapojonava.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2603153f75d55dfebe216d1adf58443/88537996759.pdf
    • http://jrpst.pl/userfiles/file/38513725458.pdf
    • 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_off0000d866.bin
016be65ca55d5cc139fe8a6b1ec34b22e0ca6082a0ba5bb1aa53bb62c7a996a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 18748 bytes
font_01_sfnt_off000108e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
font_02_sfnt_off000120f8.bin
565c6de1e816b163838b2ad9b66c7fd16d946eef74b60793dd9f940901e2e843
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 11224 bytes