Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ca5405862f6de5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 23:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2bb2d9b1a818fa1a729e1e95dd3fb3e7 SHA-1: c06216e983902c0368a5156e5adbf577e4ce7d92 SHA-256: 11ca5405862f6de5d0316907f63e0cf09b8bc05c7922fd010b3fc52fb7f4cad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=android+games+mod+apk+website PDF link annotation
    • http://verkaufs-akademie.com/userfiles/file/giguxunizefesuto.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/30291805324.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/rapexileduzowekepeli.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c973fc8eff937816605954708c2b979c/87395952976.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a94cdda0---29210029546.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0a0b4c41---66252810829.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/nowokela.pdfIn PDF document text
    • https://thehouseproduction.net/file/68324236006.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/41847247516.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905010756.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/25044956350.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pevijikojeduvumexu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kiwatafazuxibadov.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8811c15da696f76ab3b13056f5f7c9c2/85851788536.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/45030336917.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xanozekaviwoviwupanifuxu.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210905005719.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/20397458764.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/suxolomeniju.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jadamo.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83652994200.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/nizivonufapizakel.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/70359542345.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/43094526227.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 16608 bytes
SHA-256: 8311e88f4cfdea771c8e29a81bf84a551e51579f3a5934049c04ce100ab10163
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10988 bytes
SHA-256: 225c967bd2b3ef0352de4edf109be374237664b6e5c3137d479e6eb15fad10bb
font_02_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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