Malicious PDF — malware analysis report

Static analysis result for SHA-256 8066ef060e861e44…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 23:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfb1e6f39ff15c1f373758765e64f558 SHA-1: 0371831fc9adc89dc689f2996d619d8e63255d0d SHA-256: 8066ef060e861e44fbb719790692f3f65a0ec14804ff37617d5f4e282006b280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm, with many distinct hosts pointing to PDF files. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://djennebeads.com/nbloom/fckuploads/file/wakedigutexa.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943072ca9b---66806742954.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/i60cd12h7lgapjvgmjnootrp0g/78384043327.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/kiwufigarurog.pdfIn PDF document text
    • https://medtek.vn/storage/file/36644816951.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/49677090032.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/ximiremapor.pdfIn PDF document text
    • https://actorconseil.com/files/file/fizinofubovilereju.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87c92670c---kuwetalivoketoxixere.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0052695a60---nefesijerumanowuxifolu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a9b5615fde1bb395bcf4678a25e1d301/dodadonuvupewi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/2101819957.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/74usu8baqsstb9rlvip1qnkkks/35593817691.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/wanuwigamavelebeniwe.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/mepedetepagemojas.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ef9a5753c---29504656203.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0d13615bb735b2f03bdd5a778b0bf0b2/lumubelagarorif.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/bagasuziloduses.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vidilekitetes.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb94b1689---detugonomajosemosudi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/wobower.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/574c9e3bfca900baf62642770b7d23b5/11474407500.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/lawolodoseruxo.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/70738550759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=converter+jpeg+em+pdf+downloadPDF 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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 10896 bytes
SHA-256: 5951fc697702d60e27b42bdd0cafc7c1f655dce100af591f86ea60f4e0f31d3f
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17304 bytes
SHA-256: 1343270e96a1bf297f79cc57e26b7daba693f142a7853a45da1b64942f982825
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1