Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd60c084bb60f37…

MALICIOUS

PDF

92.4 KB Created: 2021-08-13 00:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfcf099032cbb3c0b403b537ff5a55e4 SHA-1: ac710131c903080e4fd78f68c96f59f684f18592 SHA-256: cdd60c084bb60f37f783468d036fd72bc736ee6083dfa92df6b0d4887f50ee94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3ae82e75---mozoganumipijajeweken.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dd841b69045796b3e53afaea039c319f/dawinidoz.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5146623fb1386150375b78c7c2b33/36994111266.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7bead9a9e8b041dbdddc77c40518bd6a/22443147125.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/27102030598.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/72299936625.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/84c24013be8be803842e2ae445f6c0ca/79969307130.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-25/20210725035859146197.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210715_8BC23C0846EEE998.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fiwokojomotuzarelupusodox.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1374d511---fufegupolamuridadexutafi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e0fd9bad---kulekomobosopepose.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab503dcee---89927866674.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/38173333900.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12d160e94---67210977495.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/96128081805.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f7b23523---14776845361.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/mepadoforazel.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/76207194307.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sebofowil.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/timesanawabamif.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc6d7f613---88959015396.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc0666323a---31334288675.pdfIn PDF document text
    • https://cecprint.com/images/file/godevimolivi.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/lududuburikuxakivinufivaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2011+volvo+s80+repair+manualPDF 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_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10888 bytes
SHA-256: ae308d7f9d3576a368f954ccf6c68c5a56665b2c8338c15ac5314e314c890912
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16504 bytes
SHA-256: 006fb5c166de1e29ff9c4f0a3948eac8972d8f41e0efde87422fca419857f880
font_02_sfnt_off00014ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1