Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c56a228d31a69b9…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 16:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1309a8bab754e6abd673f585170cfe87 SHA-1: 2bf034c051bd40ee0e4fc45d19a142e592f85e58 SHA-256: 6c56a228d31a69b992ffa636aa567c89c5bc98ee5e16e45f54b54c6e9eb4246d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with many external URIs pointing to potentially compromised CMS upload storage. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

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://redskap.ru/userfiles/file/86019347699.pdf In PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/11437101730.pdfIn PDF document text
    • https://computerzone.pk/file/66932749188.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tilepumav.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33787266253.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/loxijerunur.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/koveruzetububexagaze.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/faviv.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc818e7ed---32549905077.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/83802507199.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/6552603813.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6e619170---kupiv.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/rutokurifekojoveden.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j2h7t0agogqsj38ld57g2350mf/86785308250.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/63778c9b5cb3c7dc7ffc7a6e7de4752d/91692117634.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/negadutilizisuguwo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da66ef6fb70f05766439f46dfa7ded86/vixixifuravizonikojijon.pdfIn PDF document text
    • http://chapelguild.com/images/usr/resurovebinafevatoxoxob.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/64037528807.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/bf14e8775781b3633b67d4fe74232b40/22137024921.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/sesol.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7q0mavr3mf04he13p5c8uv9ie/mowisesexuboxoturenagoj.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/damekulenibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+old+guard+freePDF 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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 15992 bytes
SHA-256: abc2b22681935744c065b39f8b7d538893c7fb98ed2df3042df1ec4f439e8dd2
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 10232 bytes
SHA-256: dbf87b1c161c2675124d3fd4703029cd10ca12d9b90b6365c73228a7025f9e3a
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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