Malicious PDF — malware analysis report

Static analysis result for SHA-256 79af5780ea90f670…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 23:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a75363653b4a78c9fcb3a6fef5062210 SHA-1: 123206945a5fa6e06dc0173d3e5509e9ba85c500 SHA-256: 79af5780ea90f67064aa84b3b2a5cbd98a6291628fd48e90f3cdd09590ad0c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f389e26c5b---65121133651.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edca6f3fe7f---22336629891.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/foredadofijixodikum.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ced8c912e08---96922610511.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/29867240744.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/de6933234966bcb17afbc2fec603ff5e/xakovavoliworo.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/nezamevozixiwovisa.pdfIn PDF document text
    • https://ocw.tw/uploads/files/zegewat.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/nawutezelerajuxun.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/aa67766979db4a9bac83dc102d144b8e/47656515361.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pisijilemej.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/55618408482.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210818221247.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/41110792941.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/sevemixasisabuta.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c4bffe5daaf99f15c526609be9fc0ac/16405265934.pdfIn PDF document text
    • http://mav-auto.ru/images/file/12196210007.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/g93pjlhlhdrtqfq922pt8vqgd7/paxawejupivesotamawu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xusagisesomegaripusijogi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b96093df---kurijavituxosixuvipedopek.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/877866113.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/42216982761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=organic+chemistry+book+for+bsc+2nd+year+pdfPDF 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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 17840 bytes
SHA-256: 699b48beacaa08412ac109e10a5dfa7a25a3aad2a9ad8655466accd68750aeb3
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 11512 bytes
SHA-256: dd5d359abbf986ec4c513b7a313eb2a8f2d20ac087bda6d83c5bf3b0a2e5fa37

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