Malicious PDF — malware analysis report

Static analysis result for SHA-256 80336bd1ffd1e2fe…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 16:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebc55ddcf7282b318233c25e69bb2f6f SHA-1: d72018e7cf9bb9286fbf6de33c69f2d1df20d193 SHA-256: 80336bd1ffd1e2fe1fbb364635f3d8195d2441287a27dd4e0dc9573882c1cc98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate an attempt to leverage these links for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://huntic.ru/uplcv?utm_term=sunbeam+rice+cooker+manual PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133ad959f84b---96958508515.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/83137737180.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pakaponikosariwufifu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rifelodapivo.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/71423704383.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/6373097634.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/jerabidowez.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/15619287759.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/71136293588.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4b1sh4lrdonrqbtqm2leto1d5/58874783213.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50bbb4c4b---88910442404.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffe73df8c---10298500102.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a8e7476b---sisepulukoxof.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/34549816600.pdfIn PDF document text
    • http://24cvety.ru/upload/files/96147281380.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e126bcf76a6654ea81537e9a011bb78/42093885532.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e370aada---samapasamutox.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/21894644359.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dagekusafisuwuxasonaj.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/rexeminunesuzezakirol.pdfIn PDF document text
    • http://msiutilities.biz/documents/30753649870.pdfIn PDF document text
    • http://sun-eko.eu/files/file/31997355618.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/lirur.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/21500349918.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jemajuresozomisap.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/bimeretenalefu.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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10532 bytes
SHA-256: 27a491f7dd6e1c76a5d7e2c622f060d2a0c6a6abd7954ec82d8a46b4050311aa
font_02_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 17940 bytes
SHA-256: f1df2b6c75f0b07acf6d4eab99671349cfef3cf3a0ff8d3e7d2ab9ff4651251b

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