Malicious PDF — malware analysis report

Static analysis result for SHA-256 c557d4880af3cd82…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 15:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f22e7ccff0f351a781ee82a6ad38494 SHA-1: c37b03d5b2d5cb66aab3927e5164d9b4c66d4d2b SHA-256: c557d4880af3cd824cd03a0ff37f5c9f3a970bf4580fad1f55e732fa3fe8d740
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, 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. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=hercules+1997+putlocker PDF link annotation
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kpfnnkblt1fl41esdvm8phffcg/4481991022.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96f088364---vilivu.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/90008319694.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/doxirofore.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sijetafu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/19058907134.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/31418740697.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/79852165432.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/gikadinirekogubero.pdfIn PDF document text
    • https://lasanisports.com/files/29868114377.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/ganisovega.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210909081329.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138215131ad5---21951925259.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa3b79daa---xatad.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/lixipusakamoxami.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/86582264248.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sudosibavode.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/86072300813.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/16004964630.pdfIn PDF document text
    • http://gnox.vn/upload/files/39444679960.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/dozireramabizefivaj.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/31039457162.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zigetariwubudatipomunoje.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wibivemo.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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 16120 bytes
SHA-256: a5cb0df1a0a0226e007001b30b61e60d02b390e1aff3c49560244aa6cb968a5a
font_01_sfnt_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10464 bytes
SHA-256: b6b33fa45b05e4cac2bea678b4f1af8139d0ac57e2c58d53c1acd94bc76eeadf

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