Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7957ba6b79fb88b…

MALICIOUS

PDF

105.9 KB Created: 2021-09-16 11:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d62bb400f02709fc334a046c5705902 SHA-1: 10dfdccdde6ed873adb66d0910aaf4694255e775 SHA-256: c7957ba6b79fb88b33285d863bcc117e0e6a0e8687644c2b0eded2c7d6358368
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://albertf.madteam.net/ckfinder/userfiles/files/jofepuxupinubugupud.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af84acc936---19067242750.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pisosob.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/nezibi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/70305c52c6ef0c9e0bd44bd30b5862ec/pinixakeles.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/39835412475.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc51bb3bd---3315420783.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/bomojedufurajidudeneve.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/88627344541.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/fitupabovawulijak.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/54954017170.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/87402491201.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2134ff06---tafedokatarosatuwiladaker.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/befajobav.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/2538346710.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/pagodefiwinaj.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d91bdb11d---48117100206.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/wukufagarofufawu.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/pibujemewaxemizopezaka.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jufaxab.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7mqp6pnhkjhhlp93m6h518ao6a/sajunagadaxuxatubomegizef.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/29105957511.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/fujinikadevexaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chrono+trigger+for+android+downloadPDF 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_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 18108 bytes
SHA-256: d1973d438ebb46fc9f1a28cd8f9b73d39ec9528094dfa06e95a55da9c6b5f77b
font_01_sfnt_off0001694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694B 10584 bytes
SHA-256: 4720b312cc0d316dad65bfe811e9fb068578ec56aba5310bbc50b75cd88e2764
font_02_sfnt_off00018146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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