Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ca5bc5bdf072cf…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 05:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71b7a757f0ea1b9c8280c0d4a0c3a8ac SHA-1: 451ec39e320512da1f167d609213dae57c0b70ab SHA-256: 32ca5bc5bdf072cf1eb930531d5a5e351d1afd0fd83c6b4b4404eef89664d6a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+see+time+spent+on+apps+android PDF link annotation
    • http://kleni.cz/userfiles/file/46074025099.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090711182269.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/31920663815.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/visumoxiwaneguvola.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81152578245.pdfIn PDF document text
    • http://cpviettin.com/upload/files/92024345921.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/daxet.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/lozoji.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bbc4d62c9842537edf136fdc7fe4b49f/nidaserosasizixeru.pdfIn PDF document text
    • https://phukienbep.net/media/files/97183962186.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c2b4e80b---41613286965.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/79507946102.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/kevinababigusuzubuwididug.pdfIn PDF document text
    • https://fong-cai.com/upload/files/22254908956.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/towilesujuwubumakonad.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919dd99145---bipin.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bozurosopazejelalop.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zebemoxidonawepexenu.pdfIn PDF document text
    • https://hojoairport.com/images/file/lepexogunuregasiwe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dc2b5a4c---pewuk.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/9044833412.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/38391215463.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_9E1AA904E8F46DA5.pdfIn PDF document text
    • http://elitacasa.it/images/file/11216244363.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050412513955.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_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 18680 bytes
SHA-256: 6b3512108f28a7b1301da18929ef053344b929a1cb275667e5225aa010ad3fb0
font_02_sfnt_off0001529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 10584 bytes
SHA-256: 6fddca80eb6c7c6a5e698f9afd7ba8c33e1a71ebf68f999a5ef8bcee4461ac60

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