Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc9f9e775d6af11…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 04:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0af619112e7eab1a0143e2d0b5c1ee55 SHA-1: 6bd75457e85feef0f38fa563b5abac11ad495cdc SHA-256: fdc9f9e775d6af116ce1b8dddfccbdeb5956dd81e3acfb22005f1bcee66fa392
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing remote support software. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicates a phishing or malware distribution scheme. The document likely exploits a PDF vulnerability to execute its payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pistant.ru/uplcv?utm_term=lighthouse+english+grammar+book+pdf PDF link annotation
    • http://bestapp4u.com/admin/uploadedfiles/file/45352120078.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xalogegojigopa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/411171c7f6adb4b8e553167335963da5/wuwopevisirudade.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c0589eca---87230558730.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/305507019d4e782cbc4a55b5bbef5ca2/benusesevepozixadugixel.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gusewin.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/74397231730.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/zedun.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/29409912285.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/2082910102.pdfIn PDF document text
    • http://vizcsap.hu/files/file/xiwiva.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/gasokepu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/88797299233.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39508757319.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/dezakalevuwoxifulaxotu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/89619101261.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/niwufinirekeb.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/timojixoruvopulafagov.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/jupolefelu.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/gokogituxiwifed.pdfIn PDF document text
    • http://emannsltd.com/userfiles/nidorosejobezitumol.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/49927868119.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/39356193697.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vidatozetezilozosakupon.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/57843779738.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46922806232.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6c40d040---86338151601.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_off0000b3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 16676 bytes
SHA-256: a84f582c51e6949dbcca1a02c440ba70c547ba8a9ed68e4f85e135a66c3623c5
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 11232 bytes
SHA-256: 68805f44fd23f4d86c1efbc50d7fdd9238a7e1a8e45edc3b4f6c056534a8ddeb

Open this report in the interactive analyzer, or submit your own file for analysis.