Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd04b774ea8df37…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 08:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8bdab8e8b459eade11bc305623946d4 SHA-1: fbfb1fe004b86371dec08a514d4d842380020ae1 SHA-256: 1bd04b774ea8df37a7ba8b6bd18d80561d555811aebd3fadbdf9d5de713c6214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=wallpaper+kali+linux+for+android PDF link annotation
    • http://mediedil.eu/userfiles/files/5376888903.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wixoboligawizeb.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/dikipokugajunoximu.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/wiwolabam.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f466b5bae9---63986422724.pdfIn PDF document text
    • https://capecoralliving.com/media/file/kupajejiv.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/refakizofasobibiribu.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/48102012774.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/23039148602.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/57081741320.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/97670703325.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202198928532560.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b11cd8f16---56722658796.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161332094bf9f3---bigedibuviwinuv.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/14993201659.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/kotubatef.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2682a70109f1778e815f4295e869fc47/32251765090.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/85215871608.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/xapivalufiguluxonipamijim.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/30591357243.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/14589010531.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/42924349150.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wozomamaginozalefufoduvoz.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10512 bytes
SHA-256: bd092cd98f4deb2ba19f507220c00a6fe7ffcb09d6e75ef8bcf5a3a542759ad8
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16832 bytes
SHA-256: 75b390a2bdeeb36fad3d760901e284f4209090cf26dc529bf3c7a62a79e3bfa1
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1