Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b3d494ef8ff822…

MALICIOUS

PDF

112.2 KB Created: 2021-09-01 16:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b311e35b68fa3ebdee76941dbdc90269 SHA-1: 0a7b2cc94823bfa1911bd6f51b0b205c86570b97 SHA-256: 76b3d494ef8ff8223bb2d4caa9742f7a162a0cacbf6de9e7c5cfa8ae7a9a64b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chaitraglaze.com/uploads/xibukemaxemutumilixuwo.pdf In PDF document text
    • https://gregor-biffiger.ch/userfiles/file/11608794576.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8060b6d17---wagoreweviwukovez.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotitonozepofikomi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1e9406816a6774593b0c26722381dd75/89253984721.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f7da9b28---falibidubajur.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fd8f63723d0d8a085739d4cc14979c15/51417448632.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c347563c---wowedogiponirod.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/90666571551.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vde8cu5l4k6mfeve1othejg4g4/16089715050.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/84980373919.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cruhfaqp505sh47o6hraikpugd/labezavukava.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210523080151.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/18110056010.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160867df1ecbb2---midosokuvatir.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/niwexebakugi.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/buzowaviro.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/napudiboxozimigesizinapi.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/65480315243.pdfIn PDF document text
    • http://indemo.pl/Image/files/54286890279.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/rakilirirudil.pdfIn PDF document text
    • https://auto826.com/uploads/files/lubopukorewu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3801974a64e5ac1117bb67203ae80b0d/43577990281.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/66262300802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=god+save+the+king+meaningPDF 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_off00014b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 10748 bytes
SHA-256: e981be7e5143cfac8db2df3554f6070eb097988ae4d0838637b9319b02e79d6d
font_01_sfnt_off00016381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B93 21248 bytes
SHA-256: 6c6c13f289d21c7eaee57a91ba012f08cb3a1a3abd939d08d0863d7456fad0ec

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