Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b7856b4d62475…

MALICIOUS

PDF

97.9 KB Created: 2021-09-05 15:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 863ef469afef5da592296e5165018f21 SHA-1: 2b5824b70809a11a31cdcbe2a2fc0644847a00f9 SHA-256: 988b7856b4d6247564d8cfcfba9f4b62217e0de57b603ba944b10d184817895a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The embedded URLs are the primary indicators of compromise, likely leading to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kd74tbo5ct29usaojreo1rvcti/wifagagasoditujikivomek.pdf In PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/najilepajipo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e1713c160---fejagojil.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/kojopopopitarore.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3becd6e3e3---wevajepunuvisuxop.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/gafabaluwujulinomi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tvt6gll6k5rn2gohv0kqg2n381/rojozemisufuvefaregotoxa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fijomaxu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84b1f791d8---mimegawizaxovaz.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/9073240766.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/68195810269.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7a1ab344b48e10aef78eb89646efad3d/kawiwowamobufimiju.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f78982c7ebee5fb883648ac32946ad00/sumupemelanitamara.pdfIn PDF document text
    • https://topupdana.com/contents//files/lonuvuwidobadul.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff497907f52fcde701a0203c8c617dcf/71721574092.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/58048435456.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077927d78e65---36544262130.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086908eb407c---xejufebojevizoligufavov.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/oj8h5lokbktmijb655rs7hqjn5/duwonidalujenexatoluduro.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b130f15017---38769331548.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jerofumikakufazefezebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=thematic+analysis+pdf+2015PDF 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_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 11168 bytes
SHA-256: 414d0d772853d69e1d51ea5c67284edbab04aa687794cfd951708069c9195321
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 18524 bytes
SHA-256: 8ab33de6e43a731cad53d61c3877cb9f588e15582fd5b8b4e66543a2a0ca6a70

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