Malicious PDF — malware analysis report

Static analysis result for SHA-256 917be7f2710251e5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 19:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57a199e5918d5694f76ba6c25590546e SHA-1: 680cb3b7c9c475adaf6e4cd53a0f037d26034eba SHA-256: 917be7f2710251e53730c2528c53a68ce1f362c8982ce710ee707f66717539ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=we+are+nations+church PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e35c6a837---27286692628.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b6b5eb49---terijijim.pdfIn PDF document text
    • https://adium.ru/userfiles/file/74933168835.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/42940049918.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d558232b7---suvenit.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/22480072912.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/65687121665.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a530490bac9---wisix.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/36150288632.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a89d0289a46fe4f6ef63afbcfeea58d1/duretuw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114142d22dde---52417875925.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/3391776588.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/36944174768.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/g39ra90j1f580iub8ihirgq7qg/29592491957.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/megazexiben.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/zidalalisonupemomoxa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c19131bdf37---vexojoxiwogazemifazamap.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7f66a954762c1aa39be3d1677f4a23d6/newikemugogufibe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fbd898b25be53bf632547cc0cac2a908/fetibidenaj.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/85151382603.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sozoweja.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/zosumanebe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xilozawisaga.pdfIn PDF document text
    • https://noddy.nu/images/file/sovawegu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9fbe1243---42098315580.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 15904 bytes
SHA-256: 2ae88f7adb4aae41262ddccce7a2a0dee19e15ce9d94c7ec5953951f5413d614
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10376 bytes
SHA-256: 9b0bc5f6ab3e622a89643b7863fb47d885247bdc124d1ebedc0cc3d9c82e3ca3
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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