Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3b339f5fd8736a…

MALICIOUS

PDF

78.4 KB Created: 2021-07-04 19:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f2dd4ec0f0bb81a1245521dd8c1305a3 SHA-1: e6d79027a8a03c72cc87ac2c681b0dc8fe724b15 SHA-256: 7f3b339f5fd8736ab080c01451d3a03f0ccf973169898e1307f5c566f532bbed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, as the document's primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=welcome+to+the+church+of+the+nazarene PDF link annotation
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb240067d---rutoxaxute.pdfIn PDF document text
    • https://incasur.org/temp//files/tixegifuxidulu.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/48553996245.pdfIn PDF document text
    • http://ligneus.hu/upload/file/zabulozozituvivifawar.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1f75e1a3---41201730814.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ilk89e9g7rg30it800ttr8ch06/45153144965.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/24745097504.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b9994acef460b7c04568a4ccdbb1f94/mobewuxowobiwusalijoluri.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/xebinevamul.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/68716635936.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/70182924871.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a8744020---22546344986.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076495764328---nukoliperekipavunudiwirit.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/reburudoxotu.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/timiretoxufeviso.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a1cb13c44---50976893892.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd2be6ca43---56476528608.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wajewutigudemo.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/71238668998.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e22826294---vusekazonis.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0c19fcd0---55874387419.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/soxewugoze.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/supapo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9bdf4470c73b8392a28def50a8ce82ea/weloligoxilujati.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/1423774078.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850a02d4c7---46862773252.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_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 17052 bytes
SHA-256: 46ce1e773f07d613f2e8cfee482c48d3930abe7b2118681709e224e0fe749dee
font_02_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 10496 bytes
SHA-256: 6daa284ea9059bd794cfc8eaa5504bdb38cf51b34e5d90fe4ac265a61e125e0c

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