Malicious PDF — malware analysis report

Static analysis result for SHA-256 6551ca7c422be08a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 17:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8acd72ea1c192b6b2fabbe2202c3b4b SHA-1: 6b2933706cf0526f87c955a65ddb124b2089875a SHA-256: 6551ca7c422be08ac5553fe606aca1ffd781291b66ef2fbd2b470715e6d189c2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of multiple distinct hosts and a high number of links per host further supports this attack pattern.

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609befd457f57---73201018647.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ta2t7jb6mrcji83pmluec2n7f1/givisusewamune.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73d8d3085---tinunuvo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1me921rnt9k9p1t2sg02l1a285/lawuvunalizusoxonitolu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tinodokijitufetuwixasuna.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/mudikebibuxagupukesojil.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/vudosiwaso.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bupejuger.pdfIn PDF document text
    • http://mldinsaat.com/image/files/guvugigekokezexex.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/zabejurodisodubezetubipif.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/zokoxavizoz.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/77548712293.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60696f349---pamipenel.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd2a34014---9970675988.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cdc2d686d---togetonajalosakiwam.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/18664889532.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cbdcba4a9---mimebupiwuwu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098b52467a94---moruposukewodovo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdeed2188c---17108707074.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5332792b---lagiluwitetigisa.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/54410495138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=itchy+red+swollen+toes+in+winterPDF 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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 17640 bytes
SHA-256: f6d8477244789a7dc2fb2e37a933bd5cc0b8a4a8ce493aaad18c08effdb8c47f
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13259 10456 bytes
SHA-256: 3545bf9fa3b96c08dcd631585f93f96ec5096d71f3e78ce820e2e4f03df1ae59

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