Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ce170e2f2eafc3…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 84918745dd998a4d09c80b5f3e18139b SHA-1: 28f4eecad61fc049618a9216569d0be87f0d41dd SHA-256: 71ce170e2f2eafc3684331c934c17bd6b1cb1e04b9fcf1b377792dd851187058
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/955e1a8715e1a15099c7606ec2c045bc/kekusulebup.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qkhsqdlmoc1cumneb8cthv3nq6/22351022595.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa2e1b963---zufakixajezevozeg.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/42635113511.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079759d85e45---13129299528.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/tederupola.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d777f864d30---taburiziri.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac2707923---buzoberov.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/natebapizorunebajuwowedap.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc0832952---46502616088.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b8471a12---kominilisanurire.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/gofewajiporubevedowomud.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753dad5b02d---82394707390.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160755171a53a6---1820156023.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4a995dd7ea85cd745e8330f8fda82c22/jumubetamovuva.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zifinebiwimo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/00af914f2646b167dcad80223515585b/zawezaridug.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2f8f5ddc13004ed8218560e1cc20e02/89469051901.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/lerifemalabexetefoz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4sjlorj5phi5o7641q6018h0fp/98896968758.pdfIn PDF document text
    • http://industrialdevices.in/uploads/wabugigupigegijapaberul.pdfIn PDF document text
    • http://citra.cl/userfiles/file/71288651551.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/legumiwidexeponamisuwotox.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7n7dlnokedgabp0juu3l7pf4d2/mitur.pdfIn PDF document text
    • https://flyags.com/editorResources/file///nularolugisewabod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=league+of+legends+free+download+for+android+apkPDF 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_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10812 bytes
SHA-256: 262a5df334e4ca327f2d83dd8a6678bb1705d713900893f6be2f19525c56fd40
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 17140 bytes
SHA-256: cdc0b89f0f5b29fc6c7bf3a817bb6fef0b0d32e3c22086c46c4158d6e29abf19
font_02_sfnt_off00013cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1