Malicious PDF — malware analysis report

Static analysis result for SHA-256 196ea2597f2ca940…

MALICIOUS

PDF

168.4 KB Created: 2021-07-06 20:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fe3044489ce95a8e7baf563dd5e83ccf SHA-1: ab0e2fd7f6d542b325a037058abbae3eafe23862 SHA-256: 196ea2597f2ca940f83ca84a6904b77650814ed83ff707124f6cbeadfe175c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://oniceh.ru/uplcv?utm_term=mapping+and+structural+geology+in+mineral+exploration PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/64412530680.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160700925cfe07---liviliv.pdfIn PDF document text
    • http://gabortech.com/admin/file/majub.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6cf97b92b190cc97127774014e46acb3/tonosaliwibejeluvejanumak.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e3ee42c5ba59eebfa9f3c82adbcf4750/74591595355.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_926B37A942DE91F2.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7eaeecaecf1f05f109b3576c83d84099/jewoxaxijorasor.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807797523b3---11484597886.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0dbc1ba1---50910468302.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210615233233_y8rdtt.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/92372074134.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8dad6bf---wumazolisa.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/1260323278.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/71462064724.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f8859c96463e82a017c16b3f20ddca74/jeraroresumulamumek.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fcdb4d97---32410023436.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/02b04b2c4fb2a0a8b296b32e4ea6f625/gerobejonobobibuzesivik.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113e0eaec2---13715076222.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c666e434137---68772610416.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/42904015624.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a4fbdbf092fc3c74575c31dbfac4bc55/dukuworobivivigomuligebad.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8baf9b22741c1e4c359034e3e725fa59/mazuwuruxosuzowufubiz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/371407d8acd802d3093b2fabba70264b/kubagorurozovexawunojer.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccff2719f---97510129306.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_off00022f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F3E 11168 bytes
SHA-256: b2e24836fbb2c8320a08792697a09f0c0e3c82228947964caf19b58edc55b08b
font_01_sfnt_off00024932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24932 19320 bytes
SHA-256: 39d4481becf3f1f23e19d4d86ff823a558b2b923c5e0faeac58c93d338cd66ca
font_02_sfnt_off00027b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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