Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f9149e593f264f…

MALICIOUS

PDF

86.4 KB Created: 2021-08-12 16:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b50d70bc1ea602dd7c52c1c46495331b SHA-1: 01e85aca708ed2c4661cb19e9430064408d42c78 SHA-256: 42f9149e593f264f3e4ed1e1461b97f326433cd312439b239bce18736952295d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cukierniabrzezinski.pl/www/artizam/fck/file/65189927308.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb6edc429---xokalen.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7685e2b7172778253b3b0f53fac85d61/98637379640.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/83118891535.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4f3063fa95924f348625aaf1aa8f6c56/nuragebiwunanalokalokus.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xekarew.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/de3c1edc2fde69579ded5b3c8a5e57f3/54874761619.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fb2f5e9fe---fimot.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e19bb8f1a---jenupagodabubikusaxovo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/692c2a8dd7bcafdcefebb732b01e7cfc/23316216106.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/ripipofazazobija.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5eb6a1d792c8544641752e265b1ce292/soxufubifomug.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/sagazokag.pdfIn PDF document text
    • http://billsky.ee/files/file/2131045103.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/94257892976.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3ce1d53b6---97052968380.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/denupimonenowitig.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/jumibok.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95c197a55---zojemagivifu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f505567d7fd---wawodurezajomuruvoposek.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h2qeh2oq0omqpvi10h6bo9daf8/36688251890.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/vinaxetojajijakolukuz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b335c54e7---zixutiwepipalodolakum.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/33048176295.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4f7d6c82fd623465879f0446477d4067/60342440862.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/165faee7698dda4d7e757ee6a8c77845/42964110844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=iroot+apk+for+android+10+downloadPDF 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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 17244 bytes
SHA-256: 011f45d55165105ba0df6113cafa7c633b8fb57cb52fb8e1da2437b6dff346d6
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 10492 bytes
SHA-256: 0cc1beb7d3d405cb6dd107e4d4e58c3055684a791066759aafb2147f2d12f649

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