Malicious PDF — malware analysis report

Static analysis result for SHA-256 946a4a6a6593e6f2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 03:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 192249c5c7067b03ed225a581e90afe9 SHA-1: 7acfaf4576524af7fd31ec1f514e0602e810e31f SHA-256: 946a4a6a6593e6f226674bcad0b591f5d14e15e23636575a7355a08a92dd85e0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stopserv.ru/files/file/41353109852.pdf In PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/gibikinonalanaxe.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/93770054428.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/23914881994.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/4164607102.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2ho6plpkdgs8dvr3uijg7bipk5/dewaxunuvagevigixirad.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ponasipufafili.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kegesaxivejukivorizafure.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/webepuwukakikuzemu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mpfid5731qld8bn665cbjc23gt/73210666098.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d838d4d49---jaxanul.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1cedf5d7---12279775105.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/gokoxiroziduvofe.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pededovifo.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/zisema.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nelesigakovolosut.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/42128358225.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9a95opr9n9gj36o3g3qtsmc9a6/pidaxivotipe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d80c045a9---34918878084.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/55735208642.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/o91153rqnpse72k9bt7lep23il/xanimetupijowamadifiv.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210618101640.pdfIn PDF document text
    • https://onlinendttraining.net/files/43427722587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mansion+plan+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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 17808 bytes
SHA-256: 5da644a1b86957bbabdea16abe80d2b612bd5d2c688bcc89364d9b32743ee4b4
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 10156 bytes
SHA-256: 4b6b77011fe343114d8cdc256e003f29d2628f9504b7aebc88e700cb657b0486

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