Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c90ec9cd07ce79…

MALICIOUS

PDF

82.6 KB Created: 2021-10-14 02:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7ce947dcd391b5c49c6efdf2a86a97d5 SHA-1: 877ec7866decb9623ae96817ab013a025f799baa SHA-256: 39c90ec9cd07ce799e230cef605e0b16415e982e7b790d2e3837985fe5bc4233
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bharatdarshan.net/rgroup/ckfinder/userfiles/files/18443396636.pdf In PDF document text
    • https://ampayroll.buzyhub.com/files/26424562963.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/76096816082.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/93258478609.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/8740778993.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///87268815410.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210908031915.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/rubupujolojok.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/20758493610.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161492fe04e285---saximexijug.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/jimudakivizumetanowanam.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xesifuwivijamesamo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba579db49c---wizazibobimisogujexi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b071a6cd06---15476914865.pdfIn PDF document text
    • http://podarox.ru/public/files/79843289940.pdfIn PDF document text
    • https://miminku3.com/contents/files/denobuge.pdfIn PDF document text
    • https://rosycaffe.com/file/tewanesexuzufijemim.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fekejoripu.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/puxataruwalonin.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75930262272.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/67102301429.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/90687334610.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pozavad.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rudupazixor.pdfIn PDF document text
    • https://zarrue.com/app/media/images_description/files/zebulopugafor.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e00809fc121cc863c0de370ebba88d42/mojevumemuwer.pdfIn PDF document text
    • https://efnnma.org/files/file/wugewifazowera.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/71551851107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=black+ops+3+zombies+ritualsPDF 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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 17772 bytes
SHA-256: d588b484202b4f1e1b17b5732e4b00da8a804468cc6cfea004e92241331d8976
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 11048 bytes
SHA-256: 8e00c3963beca43532cde6c6e1a03edc458efc4028ad17292870f1186f8e4d6e
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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