Malicious PDF — malware analysis report

Static analysis result for SHA-256 202b43f2b768b468…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 12:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b55971b5af09dbd374522d3042b7ed7 SHA-1: e874bc59b4b8b64c71d99b1d9d22633d05f102eb SHA-256: 202b43f2b768b4680b0159f25a43f4e3bbfebcecae4496572af56fa811c8cbd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the 'super-forms' and 'formcraft' plugin upload directories. These links likely serve as a distribution point for further malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=horizontal+projection+of+projectile PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c5bd264d48891a8a142b8caa5fc17488/xidezowijotasegi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e11709a37---25504958040.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/50110291368.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/35092507147.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24cc28b471---68095668219.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900dd47bd7f---kinavovolefebifijavo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b3ede34166e359c463d89d26e858b012/56260457905.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dalelapesuwij.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a816c59daa765235cc995edbde74c239/92053730611.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/dukobewi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3itj1oeqfdnnfstqlkuoopk03s/fedelilanomuj.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/daxutipozivopowavamaxonuz.pdfIn PDF document text
    • https://people11people.gr/uploads/File/89866178987.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075477fc8c2d---45314972985.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28db8e906---jatefavufajepotudot.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb7723328---65473067103.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab35da268---vaxowagabipelafeg.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a63b5cd87915efba0077fe551070a51f/63767766755.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1nl6h7skqbtjihvp8g9au92hub/2987425920.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/397b5ou7fpm5essk63nh14c250/paxunosisakijitovizi.pdfIn PDF document text
    • http://farashimirooz.com/files/wufasemodomevarujofako.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/dogowadufo.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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 17792 bytes
SHA-256: 56b15d4da64c4df6d6f8e01383421a405d8edcfcd392dea5f1d509936443ddd3
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 10488 bytes
SHA-256: 9010ff9cb560bd9954ce57dc876ecc9bbc2fb188c12780698cdc8bbc3a120334

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