Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821a5c335d67c6e…

MALICIOUS

PDF

87.2 KB Created: 2021-08-19 06:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43d488911133dd207dff95aa420516fc SHA-1: 4f75ca95dc7f0fb8133e69ec2e094649509ba913 SHA-256: c821a5c335d67c6ecde1d0a462b4720d6450d24ffd9be08855f480b2bfa625f4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection results strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://np21bellapalermoshopping.it/file/84651243414.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c776a20d7a---rapewovu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/11840867609.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/poxurekizigenegolak.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290224105534.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/59588296349.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8e9ca5b5---32852770354.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57da651825---70662001691.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/36456773954.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vbm6vvklumk45g0lpjjneushfi/xozenoketujojidu.pdfIn PDF document text
    • http://chung-pei.com/userfiles/file/78934304546.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/11119816278.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/vutunabalemitib.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/66503843495.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/52025091618.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/163da1a89a0b3350e35f10def834b0d8/47527912442.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9inev4l72ghffe2597song0gr/88346712858.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/441fb149520a0ec280ddcd6b7925cef4/parofurulumogafesutuda.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/wipexisuwi.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/50016349456.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0bbjoqttu43ti8gnl7q75sadvn/69688728682.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/28638066222.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/6367566212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solving+two+step+equations+with+fractions+worksheetPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eea8504c---gobagejegid.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17208 bytes
SHA-256: 07868e140538a39f4c4c45269e38aff810195a8b2091524dcca79483b57d23ec
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 11324 bytes
SHA-256: 96926f26d1d1c72f3bdd5cdedcd35d8575b246bfadf5388ad97a16ceeba2d5ac
font_02_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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