Malicious PDF — malware analysis report

Static analysis result for SHA-256 6172621889094a96…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 05:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce0800c6560cc1c0007d9563a1d7e7a3 SHA-1: 05b77eb419b18bd72538d3f434caaa8ffc0c1dca SHA-256: 6172621889094a96067579363df9a06c9ad6e54b5ffe77b08b5907e18a7fe440
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan threat. The document body was unreadable, but the presence of multiple compromised CMS upload links and disposable hosting links suggests a tactic to obscure the ultimate destination of the malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=quantum+chemistry+levine+7th+edition+pdf PDF link annotation
    • http://opusincertum.it/userfiles/files/53065801276.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c50c770c2---zibuje.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/18695853738.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/nezifaxis.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xubudoturukume.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/o723im30n68nkkd8bh93kf3jpm/zaguruziwe.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/zekitexifuzugidibugi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/ruvevobovaponazaven.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f519afa7---91007679453.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pidugilawusew.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/50792202710.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/c1co67vc9gv1r048lmf1di45a0/49033209609.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cfe003ee---86764038330.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3937a2085---wugatitonorojoliji.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kuvaluraselawanerelefuris.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/kajebumisali.pdfIn PDF document text
    • http://yuha.be/_files/file/zagidiwejun.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2dd7df17f---63156353240.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/99876005942.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/80947404738.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-26/20210626071741754564.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/rojasanavuw.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_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 16624 bytes
SHA-256: c87f0e7d26c2d3f8245d43611dd356b575dd92434dede05180898d6e42903d84
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 11276 bytes
SHA-256: 7b92c5a6086655037a0013e24b1dd6c16eba355636ccffcda5ae38e0f9959970
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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