Malicious PDF — malware analysis report

Static analysis result for SHA-256 e221600d35c84cd0…

MALICIOUS

PDF

130.1 KB Created: 2021-06-26 14:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1034b7153183b6af15ef97d61e050496 SHA-1: cd8bc6002f09ea4d541ba759f3c6792f2f95cb92 SHA-256: e221600d35c84cd0f7b1c35d9ab1e9a0f8e93e13756dda6146127a78396dad1d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, indicating a link farm or redirection strategy. The presence of these links suggests the PDF is intended to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a824d34336e---bopexajilezokug.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/puwox.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d6ff7ef8342a97ad05bae3366a22fa04/77888820809.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ede6c7d2d72b75b244a202ea58e1a99e/razuzinavika.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4df28afdd59731799fd7a25abe849aa0/kaxaxusujowizodole.pdfIn PDF document text
    • http://slsnn.ru/content/files/89850833449.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b449f5846d2---fetugiwerivumekukutar.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/88840012587.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/65015850279.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3c8684af---xeruzabakorufozipewudorof.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f588fed9---76934581480.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ma4r5jsnnaf5vpg1dgf56fe4aa/34065290712.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fef86a8c9---93440836436.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c3fa209d---tafimunatomivagagupuvi.pdfIn PDF document text
    • https://renault-service.com/userfiles/bovujex.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cac409a1---38489420985.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/jasovuwurototuposafukapis.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xaxutimov.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607819d5f1212---97779652799.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/51fff8b2bb72454eac8af6ab682ade8c/gepifapigobawinexibijet.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ba23e4f0474c8fbacdfe9251ed218a87/konez.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1b0e79d1e0---lipeguxemotilenaxigosimig.pdfIn PDF document text
    • http://c-amc.com/upload/files/boparaxikokowerube.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/teronivewatuv.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/60281745921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=racism+articles+for+middle+school+studentsPDF 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_off00019b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A6 10888 bytes
SHA-256: d57734c64bfa66e4e2314a9eadaa74a866d0ef6315477d27f7701367cdf1dd85
font_02_sfnt_off0001cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA4 17408 bytes
SHA-256: 32fa1a5202e2853f209b84c502007ad6ab2e85c29f3c5b714ed45bde7520470e