Malicious PDF — malware analysis report

Static analysis result for SHA-256 55edd83f21b1c16e…

MALICIOUS

PDF

80.3 KB Created: 2021-07-17 05:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6d4757bd6278dbf7044d4ee8e1c9bcb SHA-1: dcb32194828f686821c2d70908a38d633962196d SHA-256: 55edd83f21b1c16ebacde02216ba13e0e9ceae767853720340918eefb3aa4692
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a677e53225e---sodokamekalomododerojixa.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/21e743760f4e4e2b383757125e37cba0/digaku.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183152be92---gesasosapuw.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210609090235.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/nakomukudubafo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/norirosu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed0cef25---92691869663.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/dejomigopo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5l9ffoaojf1m73143m05dq3do4/zawodododelara.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcdb9f5cb---doges.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/76822159221.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/30938627973.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab951c4989---nolokop.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/icqpg349irse1kdk30o4g8u930/76417250290.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/xebama.pdfIn PDF document text
    • https://lasanisports.com/files/bogaweva.pdfIn PDF document text
    • http://e-hematologica.com/users//file/81425675640.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7200daf4---varaj.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507041742.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/99001438672.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/44695914592.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09244e12ba---tinekerudegulugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=need+for+speed+undercover+cheats+ps2+unlimited+moneyPDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 18032 bytes
SHA-256: d2582851cd04198ef29c1e705459dd19432bec81feb746fc4f71ae82f76eca9d
font_02_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 11264 bytes
SHA-256: 94aedba4f30284c0ba9e895d090c38103f74c87d556a9d7a1417907f6fc95aca

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