Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dcf3f35b399971…

MALICIOUS

PDF

75.8 KB Created: 2021-06-12 17:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6368a8fcdc76003fd506cfbb193833 SHA-1: 6edc4655a54445b672fb9621c2a4529c2c4414dc SHA-256: 26dcf3f35b3999711320f5d3b9fc7ebdfba6bffad1f38fd81b951c05f21f35ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. It functions as a link farm, directing users to compromised WordPress sites and disposable hosting, disguised as a free download for the 'Callan method'. The embedded URLs suggest an attempt to redirect users to malicious content or further stages of an attack, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://chcial.ru/uplcv?utm_term=callan+method+free+download
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gpt89fbt17aevg668k98i0805l/naboremekafitivokupigugu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82956337c---nijagudinosoj.pdf
    • http://www.vikingmaterials.com/img/31885191069.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609731606e7a1---xaxinorederuledabe.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d8fe268e---lunobij.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/19280666e0e4ad6f8a1281c6552cafcd/1766249292.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e4206e8db1739e7390c7f8f0b0356bb/93590959451.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b33e6428---jamexumavalelotolon.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/58666468004.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f77c6c7d7---viganijak.pdf
    • https://mfdesign.hu/files/file/38615257683.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/59884028f708898098c445de32bb2389/domolonub.pdf
    • http://rauvuonsach.com/images/uploads/files/46747459533.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24cf0ae4f---furusig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de13.bin
27b748ee931503da7bbd748c21e6b962001e2b36dc9ea055ea975387d771fc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 3212 bytes
font_01_sfnt_off0000e992.bin
b17c663a347726c008a0e1bb9b87ec3185290ce5218cb31b4842af537c3de39c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 4964 bytes
font_02_sfnt_off0000fa56.bin
0b1c47bbbc8d6eff8426e2897af9003c75e9a9ad2307411cf5e1d4b6a78504f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 11540 bytes

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