Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df769597a29acb9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 18:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00817b41635eeb8bc579b3401905b854 SHA-1: d804c5f22b9f03e3068ac5390337861ee6d6aa6b SHA-256: 9df769597a29acb9fe9e2b3afcb2a13bd8efdf1fe0db0dad810c8cef63c86f5a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hanilkwanla.com/uploads/files/21244166033.pdf
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_985549E5F825378D.pdf
    • http://jrpst.pl/userfiles/file/noxaxalowinedip.pdf
    • http://geraldinekilkelly.ie/pofixilubifu.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/36589806956.pdf
    • http://studiocastigli.eu/userfiles/files/8910561367.pdf
    • http://15881588.com/ckupload/files/maboruvevonavajikifunu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/08acfee7c90c65a6555eddd19df694fc/71684662781.pdf
    • https://careersourceokaloosawalton.com/files/public/lelozulukexufomirawokev.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/35089899995.pdf
    • http://yourhandmadeitems.com/userfiles/file/lilosefemuvitaja.pdf
    • http://alotercuman.com/ckfinder/userfiles/files/rupefe.pdf
    • http://niezapominajkowo.eu/userfiles/file/fokofesibanimizude.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05d5c4028---5857060709.pdf
    • http://avtosfera28.ru/userfiles/file/xoropurafeziruzumosimisif.pdf
    • http://www.siposferenc.hu/html/98175935579.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6663cf254---zulazife.pdf
    • https://tonmathunglan.vn/upload/files/repulig.pdf
    • https://nationalshield-uae.com/userfiles/files/saxibatemawu.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/75985417300.pdf
    • https://xn--interpeas-r6a.es/upload/files/kuseseva.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10094758760.pdf
    • http://sarkar.ie/userfiles/file/sebimanenidaxuti.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1dacda96d---rowolatuguxovufesuxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wear+os+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c344.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 16792 bytes
font_01_sfnt_off0000db5b.bin
1d2e107dd8b41d03b15bc9080f4c8f62c440a5bda263abb01bc3928b8f7707a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10016 bytes
font_02_sfnt_off0000f1b4.bin
831f6d640cc55221647b8684b879855a38b59bfc3f5393c6483d23454df81fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 17308 bytes