Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ca771cac5f1e16…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 07:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70e9bc4f5744eb6619a5902438de540b SHA-1: 2cd724fd9f417a049d421d2ac17581a3ab152568 SHA-256: 27ca771cac5f1e1682fbdf583eb6f2d603493cc62fb292bd1462e1e868b0a8ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable 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 distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/20669258404.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/mutojusazajapotapoki.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5q0maavgfnn9rctdhkv69l5rv6/pekozajoxamebulesevuza.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/smeup4gpbphm9sgiln8s13cqp4/noripadefevadewovoroxoxu.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/wuvowekapiwosevu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/rijipuwokaveno.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/4584962312.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/dozixovip.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a424ca821---97824230197.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jadib.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/62718677040.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7ee702fcccf0b92ff7789ba78e27e067/73346368304.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160be00460688e---9199789196.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/3032965614.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d61245e5f---lagunuxuwodepelewa.pdfIn PDF document text
    • http://grimastone.ru/files/jibutisogixusopi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070128d8d7ab---26258868048.pdfIn PDF document text
    • http://ativn.com/upload/file/gegipoboluvulikijelevu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882dce403c9---balosolenapunenusipona.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kt5qag5ipgqvlp81dvaanqp0i0/1835232465.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210611_063221.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea47e6f90f---mokisepamesejejevoduzorid.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nebamopamegavifotaxupujav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mergers+and+takeovers+pdfPDF 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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 17448 bytes
SHA-256: 50cc4288bad1d3af7aab6442f14adcb241202d0a8a49dbc9117f0f9c8ba8d20c
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 10688 bytes
SHA-256: 960b40489c0e8df4bb99320dd6a199e595f9cace226e4ca650fa27495b39d88a
font_02_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1