Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9b8330a6a3277d…

MALICIOUS

PDF

94.4 KB Created: 2021-09-11 03:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f963b18d8eae257369b9a7eafb601c1 SHA-1: d70a9b6aab470fda6990a358d12545289be22947 SHA-256: de9b8330a6a3277dc53cb831b92fbedebed2b206dd819b0a954239e832ba2084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://crewmak.ru/uplcv?utm_term=how+to+check+phone+memory+in+android PDF link annotation
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/lasasiraxalis.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xozodorexexenozojuwav.pdfIn PDF document text
    • https://kuepancong.com/contents/files/39581349540.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/guzafolunuzowedapew.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/janadonetabafuf.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/nemoko.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5517c0b70e37ee10afd031ad457fdb06/94811421563.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/22766892058.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84983535170.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82c5c818076b9a5304097e697ea53b7d/jubujefumanabesigekigo.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/54494245312.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/50169300296.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/51755372487.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mirabufewejenu.pdfIn PDF document text
    • https://emenu.hu/editor_up/90461596725.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/12745347631.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657358b4c4---nudugabezelafabo.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/77440744068.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/17462411667.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/zapol.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f35185eea---13043289611.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 10848 bytes
SHA-256: 8ca36d16073fa510ec0fa89d0a05013169d216e0c019a6cda74a4d62969d118c
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 16300 bytes
SHA-256: 742dabf8551866ec959fb42ac2a87ba36381553b1f7b6f60610a285e7a7994fb
font_03_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 25788 bytes
SHA-256: 3a7084695cd2c824c2691b8ec809547fd444c0c6df9cda71883b6c82d3641ed2

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