Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27a25e6610e1ab…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 14:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f2274c7153c5f9fe6ceff102a4f37bb SHA-1: 20d5fca599c461044c0db9c7c56fa10f04bda770 SHA-256: 8e27a25e6610e1ab279c8b551bdd64ec19a1d857bbc00fe393884ce4f9a39aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=pokemon+diamond+ability+modifier PDF link annotation
    • http://ukwoodrecycling.com/userfiles/files/fomojabiv.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/817f8d86707898fb9d254b1a112b16c0/32391032057.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/13112087015.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/39706164560.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wexevajigexefasefali.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/11608079130.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/85550965116.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/64227381421.pdfIn PDF document text
    • https://datawire.gr/files/files/99158853107.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/97455356469.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/viberututabogaf.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/9224339096.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/joteborujofejefelofapo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9a26741f---69154928014.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed7ec4ba9---59222579296.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zimigugetobolor.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b78102f3aa---25257400305.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31446408295.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec6b90a9bc---43085877037.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/24591148219.pdfIn PDF document text
    • https://guijek.com/userfiles/file/vexezudojizowurasim.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/95723119756.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/5352316436.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0hlq1tjjf405f8bu02d9datroh/31231260199.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/7797036177.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_off0000b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 10692 bytes
SHA-256: 3f088833a9ee0006584b86f8e1d2e598208b432cdd726d79578accf95a3e50d5
font_01_sfnt_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 17408 bytes
SHA-256: 77df37dccbde75fb362c43ca68ada028a4a81fe62496f52b8d2d9733c3fb30e7
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1