Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e01c7f0dc770e9…

MALICIOUS

PDF

97.1 KB Created: 2021-09-01 22:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 375750b66fe1611d2897bd1ca1e02c43 SHA-1: b0eaf86014f9dd7094926662d92684c1ae3a7db8 SHA-256: 34e01c7f0dc770e91a6b30b316c3339213dbb6f4d595cad85e45355695ea4337
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://ottotech.center/userfiles/file/70810951909.pdf In PDF document text
    • http://simpelms.nl/userfiles//files/lirapodanowitibasitu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099723300dae---zodovazotiri.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/52761966417.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4577966a---xufetixibilegaburavubi.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/tarepofutatonota.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bidimudagosunorudisofi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/47443322081.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/uullcr9lr9umtjl09k3r9jdvh4/fivelofen.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/41989731913.pdfIn PDF document text
    • https://red-adlay.com/upload/files/fejaworov.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160788dca76781---vogepuwalokovefe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c7d55924---18973785943.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/09bsv2po74ns2n7ikdgeclut57/xinekevijute.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nasonobigasebiwavobojinu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783ba990501---doronakoxirani.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/pimupobematuzawerox.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608640bfc0224---gegumifime.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/72164984232.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/sebekulasegilapex.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sqd6halhl003qd7oofvaec1l3r/givovemufiginap.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/42546537666.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/88soqee0c5dglnu9ft8kpv0qv4/gisekaxudev.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/kegimovira.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/pisoka.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/86925321863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=plato%27s+theory+of+recollectionPDF 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_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 20120 bytes
SHA-256: 2be413c5bf8814d91e79395386d5d235f89f57b30dec91bd1b5f54b06284acd3
font_01_sfnt_off00014591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA8 10580 bytes
SHA-256: b1a1074095a24a7bd718182a1046367a2e37e43c204e85b678add5d83ee452fd

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