Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de572b90edef9f4…

MALICIOUS

PDF

102.8 KB Created: 2021-07-15 12:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f44abd2302c29744798215a47fc93a00 SHA-1: d4479c0dcb3952c84ea59071bb36e15ed79c539d SHA-256: 8de572b90edef9f4ec935ec53b81895e8c23580ee9d99f6366ce4b1d7c91ea20
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 WordPress sites, such as http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760ddc9e7a5---mezetujufivobuful.pdf. The document body was unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760ddc9e7a5---mezetujufivobuful.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449e4c725f---77850988904.pdfIn PDF document text
    • https://medtek.vn/storage/file/mezenunovu.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/76629779758.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jobugoliv.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3b88b987---musol.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vp75ka4f07si27fihs5iqrmo53/35823272627.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/78203232659.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/mujuzebojedatoxola.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/78571723701.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/78994b0efc76844ed11762bf53c9343d/wovapobowe.pdfIn PDF document text
    • http://chinazzjx.com/d/files/50215126607.pdfIn PDF document text
    • http://poorclarescork.ie/images/66636111097.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/18555442337.pdfIn PDF document text
    • http://babamoleskine.com/files/file/53348446484.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1ffd4d2361f6f93dd73038dcbcdb24f7/30003689408.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/46e764b2d3802214bd3cd65a4d59843b/3619146348.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/badexaruloge.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/95095044487.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/mivorasakedek.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082436040d64---38978266337.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb0a04fc3---berenekakifoxaz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/24054604744.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b735b23a---xabetifusobedamobekul.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4e57cc0---77950000642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=commendable+meaning+in+punjabiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10772 bytes
SHA-256: 72c71bb1372c56a8471ed94d355a4911aeb6370f4c1fa613bbbf3d645b16ad7f
font_02_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 23072 bytes
SHA-256: e4d06a046aa5d878ab16531ac2df6497f225b0ae404c3f544b40e24441110890
font_03_sfnt_off0001835a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1835A 2196 bytes
SHA-256: a7df6510b8d6a3597fc2fd49258a59d263b1036bf81012df9506b8b91a7750ef

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