Malicious PDF — malware analysis report

Static analysis result for SHA-256 250a8df2bf3290e5…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 20:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3ea2cdfb780c08a1f591a88e9eab4cce SHA-1: d34fe3f66590791f5da29228d77f386e33706666 SHA-256: 250a8df2bf3290e52fcd48cfe7daf790f59ab401ab6b15d10cc46723cc9545a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://saothienemb.com/uploads/images/files/70984887066.pdf In PDF document text
    • https://vadihosting.com/calisma2/files/uploads/nakujamozejisarokijakata.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/44836127836.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/junojub.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/buwudegakexosovemavubuf.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pivavobulemisop.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/gabasujuvekejadexan.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xixoparozebavewodomepome.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wepetoderikobofivowij.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/1107926571.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/tulafojavonotulixajug.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613696bf1840e---doliratogoxodefeguf.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/49933376814.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/kujilebefisudediti.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/50360367352.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/24743515972.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fef383e89---noxesezegiruge.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613343d742a2b---juxefunukodaximike.pdfIn PDF document text
    • http://greenld.com/userfiles/70828747869.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/zuvudi.pdfIn PDF document text
    • http://getem.pl/files/file/66208017068.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/nodufutexapa.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/bitenukabelotafuveweriba.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210911_FD45073848DF633C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=average+fixed+cost+definitionPDF 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_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 10752 bytes
SHA-256: 0fdfe03a78182be5bda30cc02325529e2370c87b349a639018f3199b30efd5db
font_01_sfnt_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 14528 bytes
SHA-256: 843fb9b4b150aee998a6f63650598d2f557f92c370feb4c1fd9bb4675040f2cc
font_02_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1