Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d3257805a20452…

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 22:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c992b710b579dfd17a399e702ebbdce SHA-1: 43517565eef70687ac2cda1315d2ad7d5b9fb639 SHA-256: 29d3257805a20452ab2d4fe22cebc70736eeac144ebbc83ff4b55370ea0989dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to external sites, likely for phishing or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=how+to+duplicate+multiple+sheets+in+google+sheets PDF link annotation
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/819555bd6f53301e633c3accb999b30c/71558081098.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c7937b3467001575f3e531e1eb0b425e/xiligedolajaripirezar.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6cbe7fd---zomazeduga.pdfIn PDF document text
    • https://teamcode.net/upload/files/getutapexiwam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ic39mr3u4640ndhaqb5tb9763p/30816748331.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vldvhd9tjq5qnjjrr3hlmvl09n/jewuz.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/92727745854.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/0comiodkp2n0s9fq3l9mnhejdp/dikideramufotafalifipenu.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/rukiroduliradiririnotif.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/lepatijum.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6113a1ea14fe7.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607532af49719---49200573221.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7401057746d5b68bd17f84c6fe4ca0b7/jebejuxepimigipomureba.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/mimipibi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/514eba8f128aea1f806643a6368af7e5/puvaziwawaf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714c2230e5---27195087699.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b9123029---zimukikiruzasipilu.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/64698014350.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/giboronafitabisevomefareb.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3f400a3eef9272645ac4a3d4d4b37da7/gipobirerotejavoze.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/finufufitonokoteju.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1edb3df4d---88988652414.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/begajarudi.pdfIn PDF document text
    • http://cortabellanews.com/userimages/jutadijepujeluzofoveg.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_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 11036 bytes
SHA-256: 1bbf32cc8ac7141e45dd67f58b712e6aab5ee0081542ea8d28a1e5eaf02a8fd8
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16948 bytes
SHA-256: 8785a5fb3b8ff679744bc339580d4da317d19004b7b331916381841b03f1cdb5