Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adc822b3a56a0f8…

MALICIOUS

PDF

74.2 KB Created: 2021-10-03 06:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0a626e4bf25bb1de20869ccba6b73d12 SHA-1: c860e4a71787fbffdfa4d5e7781fb809c10411e8 SHA-256: 1adc822b3a56a0f80dffe34d8bd51852858efc3c6ad01d9db82e8cbf25d943dd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, disguised as a free manual download. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/baxomaxalarapawukus.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/523d7c9520847dfbc5d8c7bb66d8d986/xebadupojuwaw.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ghb8sg84mpmd9090sgcmjel1hp/zuzuzu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/38484519911.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/fomikekelurezaziviteg.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/pesaxoduribozuboraxobamup.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d5be48f3---balopedelor.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2982271b6---motiruladopagezef.pdfIn PDF document text
    • http://mariancozma.com/_user/file/davov.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/rusomibewusufusover.pdfIn PDF document text
    • http://skolky.info/foto/images/file/99192438816.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/gajojavepigetinek.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/87204927151.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/32871357484.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/povalipodudidufozumenek.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/22499516141.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/10624966143.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ferojivolipiterape.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/89447903886.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xobafobaf.pdfIn PDF document text
    • http://laduses.nl/image/file/11088628398.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/21776782105.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/farazisaludizome.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10848467479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+iso+22000+manual+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/85068212380.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_off0000bb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 18044 bytes
SHA-256: 9cb629971015731d38d0cf12fb69982465ea828f9007c9278bd53bf385d5c536
font_02_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10716 bytes
SHA-256: 424e6a39311ffa20e9abf760b05a9b39e2421bc5d8ccd3366c777d3aaad09fdf