Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d62ae638b6ba0ed…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 00:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bdd3d538581f3e174c5b8355f573fd5 SHA-1: 8bf6e5bfd58e171f6e72ee6fa2ddae4768452349 SHA-256: 8d62ae638b6ba0ed30eeb1b256bf5263c588f4bb6c507fd417e48b8954a20369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://bachson.net/upload/file/xuzifegarasubapogusudogod.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e10a35d039d---81246689713.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/direzupigot.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/samavomed.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/22087465957.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac64575eed---5817191187.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3837ae2e---13191781632.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/95279863006.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01d68b8d6---mewowitemox.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/nomaxi.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb7acb030e8a54ff7bf2c5d0c832b718/53920391417.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/logib.pdfIn PDF document text
    • http://jonme.net/ckupload/files/65255692080.pdfIn PDF document text
    • http://tele-video.ru/upload/files/vifisusiwivoxopu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198155b1c7.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mezetol.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/valiberujada.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/72aa7nhgdtokprt81pa7bucnme/rigekulonobunowilux.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/69974260935.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/setavulezuzupebaxusan.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88b651c1f---48685340290.pdfIn PDF document text
    • https://deepex.hu/hirek/files/fusodobo.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/73595f532e2a8399b69c1e0da33d0d81/ligekoz.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/59133898811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=asclepius+wellness+pvt+ltd+plan+pdfPDF 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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 21652 bytes
SHA-256: 4a65c68880c3d8e06f326e394f66d7d42b6fa565af923ff35cc7fb8acf977e87
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10624 bytes
SHA-256: 42f59e46c7d74e1d53c92cd0ac5a9a8ec3b296a79e11580550b14f3bfd268d57

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