Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c3c0e8c32068f6…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 00:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6df5d91e4815e6a156e9699df7641d2a SHA-1: 91462547466128ba20f6926d0c8d2558b5c82503 SHA-256: a0c3c0e8c32068f6b9c8daad816b3146524d62fcbd4929d4eccf401236bcf24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=gtr+r35+2020 PDF link annotation
    • https://ibextrail.com/editor-images/nofotafagilaviretuzul.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dubelasenudixuzagujes.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/7351124672.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210902122019.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109030144348422973fgcr.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/30433374749.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/17421192524.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/20019326985.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/21462685827.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/vojusugor.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/sopolexorudukized.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613793c1c5fc6---nisakigi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/162257022422.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/44646311261.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/lesifigifopuperaxozunixaz.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt1k5u45q7fjhvh17qmiik5b5g/74533452057.pdfIn PDF document text
    • https://andhimazhai.com/images/files/77731724013.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/tejukolozadevubi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5dd354f17---92931544667.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/13278112482.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3pom1nfqm3lfc8r6osvucvs907/ditame.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/fubilexibitomizukukuje.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16368 bytes
SHA-256: b208a33b27b8c0ed1d8a30f270b7cff2021028777a5c2006fe3087b5990b0983
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 9864 bytes
SHA-256: dfc92043b78a6190cdd6d2f6a313b3b82be194bdb1a6e825403d17b3179a24a7
font_03_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 26156 bytes
SHA-256: 8f68db8476fce6986dd92b74c15efa7c428be56936929ecff8ef83940eae978e
font_04_sfnt_off00014996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14996 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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