Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e95607cb73ba23e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 23:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0b7400c05991c89e3edb51a5e5769f2 SHA-1: 7bd1070c9dc5f1e354a311e3bdfd2b97ff124d98 SHA-256: 9e95607cb73ba23efca165abbf219919fb7d9267559cc18cd2182316939a6bd7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. This suggests the PDF's primary purpose is to redirect users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vivatbacchus.hu/files/file/59397699342.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082227ce515c---63891101943.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/55683527291.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sugusugazifenudi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/icmg9tisnldltdbllr6kd9r6k3/33391981859.pdfIn PDF document text
    • http://tano-cable.com/d/files/tutivujomomexisulupexede.pdfIn PDF document text
    • http://hybsch.it/upload/file/12930537553.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da2d3eb6019---goselufatorapivo.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/3012252828.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ef0e47dba---xubuxodepov.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0918ecef8---rugemanisigopevemijefa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/63116671954.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885966b689c---63218313709.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/dalulinemajarabe.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/87854997752.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ed059266804433c486a920bda10d7f42/22457227560.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/fuvido.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608125425c977---kozutezidum.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96021791997.pdfIn PDF document text
    • http://chinazzjx.com/d/files/5355116604.pdfIn PDF document text
    • http://weingut-suppan.at/files/98961189261.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092972f6d45d---diriv.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077aab85e99f---23032542276.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/aaed50af65d80e8b3dcaff55a48a8890/50869166659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=leyes+de+los+gases+charles+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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10676 bytes
SHA-256: 3bfa452e5bb692d4ed7a4e54e978d02c635c84809eedf3e5d30caabdab1869ee
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 18952 bytes
SHA-256: 0bc3bd619976777eb9be5a01da924bcfbf2d42bd9caf57a0e65e5c7ae928141c

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