Malicious PDF — malware analysis report

Static analysis result for SHA-256 13488d59f8b6ca09…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 22:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 281e701b4813ad8cfe505d7eb915cd4e SHA-1: a39deb44ed8e39c4d360b669e4c9802936f8b720 SHA-256: 13488d59f8b6ca0900a0604e1408facaf508f15abef722075c25d9433895c405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dlzhrjd.com/images/uploadfile/files/dekopabikoxiti.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c524df19a---jazujobijedogeponipube.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369ee1113dc---43928218291.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/46343401893.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/85283968860.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/70655149692.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/supotuwezajasugifuxerebid.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/wodurepaxalava.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/87451584729.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/fixanunobimixumotoganuba.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090705092873499.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/39221707080.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/vuvibusi.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/86339333076.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/tumekotewunivaxedo.pdfIn PDF document text
    • http://termocity.by/pics/files/funedoxiwetuni.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/9522852672.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84159604568.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/22495857090.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0c98c0e9f4cf8450a5e9b0eab1201476/9763727346.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ab8687cd---kusanadonavoperulabukos.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/manedejupizobenigu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/77070655813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=vidmate+app+mp3+song+downloadPDF 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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 15836 bytes
SHA-256: ec1461cb63026eb96bfd6c8647e2b82c1c3a405d6d4fe68be6fe06dd10799a70
font_02_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10860 bytes
SHA-256: 021037394d54d384c77f061ad829335e25053ce66eacf47f837502a1d64d21a1

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