Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e5f930cc13c5a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 03:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58953cf915c024d1a48f8bcaea427b9a SHA-1: 6680896e1a51af995a677eceb0be886c118db017 SHA-256: 421e5f930cc13c5a8d00e817a14c1940edea4461261a59df6e92c41f606a9a7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=how+to+transfer+files+from+android+to+iphone+using+zapya PDF link annotation
    • https://majubesar.net/contents/files/69735750264.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/daguribaxof.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/giforapikafeje.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/72459891166.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fugetofefoto.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/moponugapaze.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/9812330459.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff83e35434---zutifewokerifokovizej.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/forofiritulokukovepuzitow.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/favekuwamulir.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109111826397243.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/ratotidunudifetuzafoze.pdfIn PDF document text
    • http://fluorescent-training.com/file/5858948870.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/danejuloxa.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/90472998392.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/31114690959.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331089e4adf---26150521509.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/letikel.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/54282220725.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gakatazolejimuzu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba1d5d6d---96409419864.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ratejazusalebimime.pdfIn PDF document text
    • http://donghotam.com/luutru/files/memowos.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/surazonok.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/zuwewofo.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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 17572 bytes
SHA-256: 63ed8095cd85cfc4937d249ee3e4cb56014238fc406b3919ca0d28875e32a249
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 11296 bytes
SHA-256: 93d07032c192a5236490e5d8dc3b10c9911dd2d8618f92cdee4ad0a8033d7cec

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