Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f374c086982997d…

MALICIOUS

PDF

80.1 KB Created: 2021-08-07 23:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e5acbe9e46c6d774925401da6f5ae3ae SHA-1: ea634ae24d5f61686b8b93848ddf2318bd2b8378 SHA-256: 1f374c086982997d0ade7e6c3afc62fe799efa040392372dc75348dd27923bbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=american+government+institutions+and+policies+16th+edition+ebook PDF link annotation
    • http://progettogeometra.it/userfiles/files/juxivanezugadisu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf22ae084---rutapatukoselafogoni.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/88400689001.pdfIn PDF document text
    • http://camwater.org/media/files/tosanikaloramumepik.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wamejufefax.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084eee926986---gujobomegabelurinuvusus.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/fenagejepifape.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/petileforukipozunezuxeda.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f99672542---sunegofabigulabepul.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cf8518a8a---30017751447.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/bilagog.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/61924854909.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/11193175947.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/396da8c094f2a59ae7327e9aafc7d111/43025633903.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/242015311756.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/gigivuretupozosufefobi.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/9511022434.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b2c5d942---lobomemufatesifom.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/jevamibixoga.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///28455373557.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6c4031d959dfc74f98f1b7d84c453d6a/sapubakulibuwubogobubife.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/vezupinofatebisoladimage.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nakalirezalejebodixemu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b6fd5ff1---99080635108.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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 16724 bytes
SHA-256: 425ddad0161b08b3d03dfdb622c6fef89a7d0dfecb73687ef132d2417f6e37bb
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 11560 bytes
SHA-256: d2ad5cc92517df8c2652e48a8de510ecb29443312ca2740a020c4dac40acff41