Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1ed265cb6c8f69…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 07:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46a036fcb80b50ea46558471aaedc670 SHA-1: 66035906401392f9ce0c16fbe9640fc2e1e7e406 SHA-256: 4a1ed265cb6c8f69779a680f23a528cba5f194176e80eb83c42b63ae14e505a1
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The embedded URLs suggest an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://gabinetpro.pl/kosmetyczka/krakow/files/77593294406.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/komivazibaxedi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/95291058620.pdfIn PDF document text
    • http://malifer.hu/upload/file/43314025359.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ce155eda---witam.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/89304915068.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/nasijowepimaxonobawad.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210915173140.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kikezofopufutavi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/84919064486.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613731bcad381---noviwu.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/25509440805.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/47178734421.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/24180306104.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/52184344640.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/761fdf102eb1bd380f1fa8dfe035482a/73789011811.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/37925083842.pdfIn PDF document text
    • https://kristinanamaste.eu/files/1574186546.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456632798f6---viridepexu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe4abaa15---nowiborozebow.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/99392203409.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/62716702810.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/rugakugalopizifikotexunow.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/1224391715.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/monofuzorumurafusot.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ruvenuburadedo.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210902_235119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sm64+ios+portPDF 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 18688 bytes
SHA-256: fc767c074536c851188c0de4488cb261c7bf0fbc185e571f10ee67b29264b73f
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 10292 bytes
SHA-256: c12fa231c0574589f9076760be9fa5e19d3ae6c730f69767405e03d1381c4420

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