Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a5763aa137a61…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 17:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 346d7359ddc7d17711a1dd6d09be7dc6 SHA-1: b95ebc5cae015a42ec708770a5b6c7a2ff75dc77 SHA-256: f67a5763aa137a613f1c6544ba510d05740647dab17bc09ede4116a838847048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc03822b6c---23582072126.pdf In PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/62942087628.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/97648065651.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/jivemepapix.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/vigefuzudedigo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/62bb981b374e9a85848e77cdbc1c88f3/4789042574.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/db5330bfdb2890b2e2182a66f1a0e628/patizoluxatewij.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gavapinenexubidixox.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d2ad7897---34194644355.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1f83e8c7---wuvoxepasunoduroxo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/940i7358sp4p658mj5krrnoq0s/jutamatorarajebalez.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/73704151476.pdfIn PDF document text
    • https://puntoagricoltura.it/file/37087633919.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/16795110956.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608433caaaae6---ravugipa.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nidugegurodogove.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c117c141fb1---vekisuvubudisalerakaxije.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jftg8i17ufn9vll44cekamsun3/saxikokubodegalobaroguri.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39499290889.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b22bf474b2456ab74afa5f17f9a8bfa9/72491681785.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/60698695246.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/fodawuzekojudob.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/55603893089.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/nisobu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/tesagawuzujexoxovibugobit.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9ov84fb86arlemm4i0prvj6h2j/90524132779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pichaikkaran+tamil+movie+hd+download+2016PDF 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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 11176 bytes
SHA-256: 0e21ec3958c26da75594ea6e2c047fb04f6a7c238ba0af51db3743f4f8ff6e94
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 17332 bytes
SHA-256: 0c81c3c4f34bb85abd80f7ca606ad62c9a279bec0cb4629f77fe5964a31a682b
font_02_sfnt_off000142e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1