Malicious PDF — malware analysis report

Static analysis result for SHA-256 176d41a547024a6d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 08:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5cab3398527e16b95d191cb9ae0b7fd SHA-1: b7b9053bfcf109832689515105e7ff1fdd3d5754 SHA-256: 176d41a547024a6dfe7b806a10256a82ed33112184a85a5313ad25c5cc0f22f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, designed to redirect users to potentially malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mobilni-kadernictvi.cz/files/file/perixomubusoxawuvet.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1810e964---24874105293.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/60272934916.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/76919234364.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xikadezejerapizerubixido.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f076363c35---45545536334.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/nanosizixuzem.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090848136320.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/888fd06c72b9cb0d4f03d8eb74f62780/monogipu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5312b609---59652480323.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/88353844816.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/69478938550.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/33982362900.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/dawebidizexomokoxafabom.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/pubiwavuxulibigitaliwimar.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/7525216418.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/93928867825.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/90350016763.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29c378331---2892768325.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/gejadoxumobatabuz.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/bunuzomukidafo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/11946894386.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/82522916313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+frozen+2+for+free+onlinePDF 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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 18488 bytes
SHA-256: 1143d0a7fbd53777c4699477dc03f982ad3a0620fec5b3facfe807682ab2ce8e
font_01_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 10440 bytes
SHA-256: aa576d029afc2ad22033a16d4d37c0819e589c3f927a46a1b17c126fdacba1f9
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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