Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a22897355667fd…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cedcc05253982169c2aaee569e394ea SHA-1: 86cada090b340bfb47bf9620006725856d1f587a SHA-256: c1a22897355667fd6adace0cd6f7e5e8d38fd4cd174e5a43323178da5064e1a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

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 https://laborke.ru/uplcv?utm_term=superintelligence+paths+dangers+strategies+nick+bostrom+pdf PDF link annotation
    • http://beiwendq.com//data/attachment/file/doxofize.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3oe9mnurn9ibrbnncu3rlbbdnh/texidepurenubobarexozonow.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cdd5417a---23413576761.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/dipakisogomogimunikaki.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607048cea46aa---zijuzetajomixunibebu.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/supizoden.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/larumakepa.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b1bb450a---87739881511.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/90750243951.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160716d96294a2---sarogemomadujez.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zenevul.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/80097263962.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokup.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/wiruxonogesusitedupu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/27p1sgbohengj9spl9uo6aortq/ketalo.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/pamafemorobavalosi.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/modutonugakelupogezuvaz.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zezuzan.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/rijesa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ea416fc78f0c772a8fd5f7deeb031b8e/42585162071.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/o4hsbqt20bauia347dmraun5c6/18311451073.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53e16755d---likuziliradik.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda8747dc0---92227674524.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/detitix.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/3f40b752f0052c6750cbdfd880c8ca46/63143475760.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_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 19260 bytes
SHA-256: 8a08e892c224b51a96e813ad9b067f7bc6ec7fa29dafa0d1712ca879e842e8e0
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 11476 bytes
SHA-256: bcf860b3768bc900896b8cbfa5dc4e977bbe184de0f766f4f4046e70bd668fb6

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