Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77101a9ec932d69…

MALICIOUS

PDF

88.8 KB Created: 2021-07-04 17:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b528b7a2e45c52e7a1216e332f88ce1a SHA-1: ad0fa75d710c4d7cf764df08100713f5d4163a89 SHA-256: d77101a9ec932d69a445d61c4da220f34b47bbbff3219aa8ede39f8724da822e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure containing an invoice or payment language. It embeds JavaScript, likely to facilitate malicious actions such as redirecting users to external URLs. Numerous URLs were extracted, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mywayrtk.info/userfiles/file/54931681153.pdf In PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/65346859904.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d91fa3d0257---lemiruwopob.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9058ed9d2a08d54e95dc3b15854a777a/853937738.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/susar.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/41327229534.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ff50e200---29473799575.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/79422742640.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/bomujazegodaja.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c78af1805---12896695951.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/2472636312.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5be3656b---jolepafi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wetabibusovizidadikakon.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4748a8886dd1d4cbc1bed3d6392ebfaa/68224332387.pdfIn PDF document text
    • https://ekransamara.ru/files/75252550214.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79385975419.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f415377f---64450861739.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/616846406c981a665a5db639053b1386/sawupoxo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f43d6cdd364a797c93db03dba60ee954/pixaxasibelesome.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sosavesabi.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mefimawadaziripeguvujit.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc7e02ad7acaa38a748e42f015b7c7b0/2550369859.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/09e941f11b1a7852714d0b673ddf13df/wejoto.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5948163220---weboxazolakeragevesesemas.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b803aae8bcc---3076795469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=special+delivery+prices+2021PDF 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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10732 bytes
SHA-256: 3dd144347c4f454a4bd29bdd219b743d26dd4d6a2f0db4a36c5d8b3fca4a4a14
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 17024 bytes
SHA-256: 47419f599c6432e4b3baa3e5e0fe1a80448e5e48daaa18c047ab3376af69947b
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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