Malicious PDF — malware analysis report

Static analysis result for SHA-256 a445a91fea06d5a0…

MALICIOUS

PDF

102.1 KB Created: 2021-07-08 20:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2e78ff6fc5cc51eb096af8ce376a039 SHA-1: 73d001318f0889c0e40bfb6471d6b2fcd18d872b SHA-256: a445a91fea06d5a032bdf7f3b9260b160cf117cd550b2ff106f7d296ab4dcb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into phishing or malware downloads. The presence of external URIs and link farms on compromised or disposable hosting indicates a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://crysiq.ru/uplcv?utm_term=two+words+verbs+pdf PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ki035vagto2fa3ihnruotfe44r/7070515375.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/30e49ca99b37e471dab2f012c9f280b0/44027501291.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mk7kce6cj8fo40g86pc3cnsk8n/88983603878.pdfIn PDF document text
    • http://uco-kampen.com/media/files/63783663058.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/kifoduluteterupufexitam.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/mubejebezilejufazam.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/t0n5mo4u8qfsmtp4buv6129r3f/73767913924.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/pumawojogovu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/jenikuxolaravibilulavunum.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/lf8v71qlu9pgsilk5aib8n3sk6/godokajewifoxenokaw.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/wagoruxuvexadenes.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/72936199395.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/25694965099.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f552e1c83b3706393cb89b6eb3d4e72d/49221338020.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/58032478152.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/v6v4jktg0lp6qgea54bgb7cn3c/26780876189.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/93834302791.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1acedf2d---26026922064.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079497b9855b---lorup.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aer7lji67ujibgohefeibj8fp7/xogunofupewopawud.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2054be6082045160234b2cfd23dc6fd1/bimazagowabogud.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210610205459.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4fa7a385b181d3738f3ebf74b15fd5d8/zekusa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/8966308175.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad10fc19e8e---84133087532.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608927977c753---79615095062.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_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 18236 bytes
SHA-256: 7244e38c38449e28ba5a6fa8a4197d40585149c3a4c15f7105f736822fccdcf9
font_01_sfnt_off00015a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A87 10244 bytes
SHA-256: c6aeed76a8a8dc943e1fb3e5ff980114a1150c28a2b09ee3902a0a924f68075a
font_02_sfnt_off0001717a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1717A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.