Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3b49731612cbd0…

MALICIOUS

PDF

79.0 KB Created: 2021-06-27 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9332c750e7c8e221e9b68c5db9cd84d9 SHA-1: e75d8fb95d1373046cde0ab8a2498bb0c877d64c SHA-256: 5a3b49731612cbd097d7f025a6da9cddac7ff14e09ccb9e48ccdab268d35efb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=afib+and+hypotension
    • http://dok-vo.ru/userfiles/file/55591238490.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e653752ed171f9b4b297bbdd47a44696/45495052296.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/08e891a5cc1b8a7d01f6d845489ee643/87740414060.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac3f97867---34325159344.pdf
    • http://alexhofford.com/temp/files/file/34560521830.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f2c3f8a3---15151707791.pdf
    • https://laatjehuisweerstralen.nl/upload/file/16816567925.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/87qs9uforpnvnhj80uhvect8g1/zimeruveliwozatisivolowa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea456c1f1---melepejezewagin.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b76becb8b8e---xawom.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a52bd6e16---zusogodezejafopuvivo.pdf
    • http://karimeh.com/public/userfiles/file/losazemolinogagab.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ee9b12dc---54393231193.pdf
    • http://flywings.sk/UserFiles/file/doferitelufog.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0dbc1ba1---50910468302.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41bed3299---siwazuju.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ihabb5kn5g6eqoa5q5nk06gnhp/8476035696.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d4e9757ea1b557e3e0580be0b714a208/41964354677.pdf
    • https://ktmcollege.org/public_html/userfiles/file/womotafekunudaxepona.pdf
    • https://bursakaynak.com/userfiles/file/waxefesi.pdf
    • https://aashianarealty.com/file/21999802155.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f694e94f---bezulirapefid.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5kifvhp6e0v2enuans67j9urgl/10316794116.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8ce797e60e57b0003b6500b3fc72481b/26261522977.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/72662672640.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d198.bin
4459a85bad6fc4f36d3ddb16eab78b708155136c65a43df64a74f9e9e709e5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 10684 bytes
font_01_sfnt_off0000e9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 16792 bytes
font_02_sfnt_off000101e9.bin
2dee58f6fd060a89a4f4deecb37eba32bd20132789fc4f492c10847a046950d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 17364 bytes

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