Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a972d0cb4ad80ad…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 14:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: decb2608f099f092b0c91d1eaa35fff8 SHA-1: 7e5fe25577b234d0991394656287737c62a6b899 SHA-256: 1a972d0cb4ad80add825cebe998747e627352367878512d8c233b7b6d09ff6c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure to phishing or malware download sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=feather+fall+pathfinder PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987fc26369c---fuwubiguxaselezifisijawa.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///20372699424.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ea5c326697b4ea30a2d372ceed64a6b7/valepumusadajodikotok.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/74990622514.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609801522c12b---siseluzafexowuzelufe.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/75497404398.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/76215276195.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb87af023---38548090270.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/suzopegepava.pdfIn PDF document text
    • http://freeski.hu/freeski/file/32005241728.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dceb20b7---33409400255.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0570d0256934ee69d701bdaebc18ec20/61152368953.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/pabivotipiwofiwatif.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/febin.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41863792604.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405be5f734---xifovafeleguzame.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_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10284 bytes
SHA-256: ee59835a79ae8ccca495f9eeb554604574f31b3029f71a97ae9c9914f1f4171f
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16712 bytes
SHA-256: 0ea66399bf7dd4b711b9324e3d78c369769e8116b0fa1e6a1d4f0a25304c30e5