Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c77ab8fb09ed2a1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 22:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9af11849c55fbb30656010849f133e0 SHA-1: dc3492705f121791d11ff382725cd7a1286a6b60 SHA-256: 6c77ab8fb09ed2a1a53cef15947ef1dc13b25171180c4a83c952d98d4439299a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a likely attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://alacarte-design.de/userfiles/file/dufefo.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/dufekedabamilogewo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/robinanoguxovazisod.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kawilos.pdfIn PDF document text
    • http://delve-cr.com/uploads/68392020911.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/47420648892.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040da64ae5---93085749490.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/fudujuja.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/mugatufagizuvojupitagi.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/83795984616.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/42196923147.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/gagexunit.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/67165e361a69ec89bf9eb95d6517c515/vezef.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/76441060699.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/6158889481.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a24b90864---62000539058.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161216b77ad3ab---47791865528.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/95109279610.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/00b0623d7731e3f9fa04e53764f9f438/7590985363.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vm21l8fqkaiern46fn8lvq6dhh/96597342158.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/femavemorik.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/livitetodebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fantaisie+pastorale+hongroise+pdfPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 21312 bytes
SHA-256: f625f80ed6405f156010b4bc784e0d89677facf94ed53ace72c0cd61b2a10055
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10752 bytes
SHA-256: 45666ee96690cc940f2535b8d6e48a385daea7d873c0a44d522c49d463120ae5