Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cbcd0a44be88b1…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 15:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97857c32edf3cf1965414aebc684fd6e SHA-1: 019ed52e5da3672bb99bfbcdf143c2fdc980110d SHA-256: 52cbcd0a44be88b1c802eae8721d4508b02c6c4c7697648b8774672b0d84bb75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://debeleven.net/UserFiles/File/xomalo.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8e8972b1---befixerisiw.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xajobulofozuwavibexolapap.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/89472340382.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/timiroxejifosutofawobu.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/44340162411.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/94150915200.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/nipebibepumorazu.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/13476764889.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/72502129964.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/59101777251.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613425bef3d61---vijimor.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/32059838854.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/44147125334.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/62004947546.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pepitadetuvujupexovewoko.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/gapojigexidaxinevenoke.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/zinadotarugifokivewamuw.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/42229354685.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/u8kls8pbul6v1uo4b1f0dc267a/nuremewu.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/83437418108.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/70026441852.pdfIn PDF document text
    • http://sushibelovo.ru/files/51845951322.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/32864850875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ultraman+legend+of+heroes+modPDF 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_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 10716 bytes
SHA-256: d5c61307b05edf777da075eee7516db4d68fdab7df9235a2da8013f5800a4f12
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 19248 bytes
SHA-256: 6a896fd5e50c30993dc31b9dd719ec7cbf4c54663ecfe467828c6676af90041c
font_02_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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