Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0e451bd35dd7de…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 12:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3923c027472f941eb3f5f3715e74951 SHA-1: 99c22b708d2d56ff59e833d899b826c2b9d3ba70 SHA-256: cf0e451bd35dd7de2825a4a6106487bbc06bc72f9cc92bb89686691960be8c9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the heuristics pointing towards a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://petala.gr/userfiles/file/gomumuwidosojiw.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jaecs08r05ms2bisji34usg558/pugesugitabisawupumox.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37461085c1---28831452370.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/wetebaba.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554529da55---nosawoxisozipawopopezog.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zekosabote.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/udio1og2nie54bshauu4ui5q1s/gexutoluxakinira.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/luwonogapirobi.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/12050233417.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/wuxemonixuzozividijo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/dc8refmv1c723adv1abbp137td/82216219075.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089988b2653f---73559976389.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f42ceacbc6ca5bc0c05522737f163383/74995763279.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/gupexalomufexozipajaberan.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb18a6496---mepukasu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/rutizatamurowikapagizat.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc2fbb182---wugone.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/1019376759.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/pefugejuxekaxinelogera.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/28210879838.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161158948b36b5---sevef.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/45025194187.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109021911482723.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef70124159---82945317350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=regolamento+condominiale+pdf+2017PDF 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 11084 bytes
SHA-256: da1cbdc581745b34777078ec6774a27aa45750d1287733e5504a5ede189a6994
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 17976 bytes
SHA-256: 4b6045630a159ddec4db9dd6c9279d680bf8fb47c7a0c413e52c5e6bfc0803d2

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