Malicious PDF — malware analysis report

Static analysis result for SHA-256 62da6386d894fddc…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 02:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d05c0b359649333fc1b9a1a8a8c5d538 SHA-1: dec6f7d3e3b9fc0dc72f9db9dff5bfa776256b37 SHA-256: 62da6386d894fddcfe6a9a0c464578ba78ec20e8c38a63a7531448608afe156a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=operations+manual+templates PDF link annotation
    • http://gesgo.de/userfiles/file/telazurozu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be36d4e1d6a---59259101601.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/sofodalisebovubawi.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210609062940.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a6e41dc2---fanumateveme.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/20cf9d759260680649fc3fc79d8687b0/45862269637.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xilovuzukigizanipinosafe.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/zejorukesen.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bde56492---2978594584.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/98530005104.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/41499223556.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104bab73b90b---65831480210.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160704e49ddaad---24888561699.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/83328520698.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/ditobawemovusixalaw.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/96999587815.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb0583661---dimom.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/podukiwibelubokofel.pdfIn PDF document text
    • http://trevorhannant.com/88000947408.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d3bb014ff7761f68c9ff9a753dadca88/98911789640.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/vemuwinufupuvunite.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/roboxazapodivelitikubezuw.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/gilexikizixadekobep.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/17330796907.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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 10536 bytes
SHA-256: 9c23c3684a2cd13282159ff3b67f5aab7a4b697c7d6264b0b2bcf976cdbf7a63
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 18396 bytes
SHA-256: 0a59f3bdd572f8994210bfa4daa460350eaaf4fd311314926cf92fdeb4c87e37

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