Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afdbc3ecc6f1371…

MALICIOUS

PDF

67.6 KB Created: 2021-09-08 18:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 584f4b52737d4e3dda7e8c109a862127 SHA-1: 4e3416d365a2d8ee9aae282f48f5df4e35da7a88 SHA-256: 1afdbc3ecc6f1371a3126d7e54add2ab5f558cc5ca76fcba78b72f099190e903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of 'fill up pdf form free' in a URL indicates a lure for users to interact with the document. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=fill+up+pdf+form+free PDF link annotation
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/65939329050.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/zugavipowesedirogadururos.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/99051986911.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/mavofug.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/38596379986.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jejexunanigowitale.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/juvadalukok.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/437fecd16a79b6198b10c81c28e4ba5b/46865534959.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/goboxiriwala.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161359405c32e6---wetotemalivepokowowuzigak.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/repuxozidogelixop.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/35968976633.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/novetibiro.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kedizovoniwowujijiboxite.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17513225281.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/46212941541.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613423b36fadb---zejurazepalunuz.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/mogave.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/14779194387.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/bakixiniletabotad.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/75a18a38491e05479cbba130bec19820/xivozowutim.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_off0000ae79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE79 14460 bytes
SHA-256: b7640928dfa09a84185b3bfa15fea8a53114d43642a9f39066516e35e9190d33
font_01_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 10204 bytes
SHA-256: 00e6f8386547b7a22c4bb77d7080fbcd8c95fbbc26dd0cef596f48efa6495c08