Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c3499d68019d60…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 09:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f769900df8faf6c5d1f5ad739478e9dc SHA-1: a5d9f6c411c0f6638cbe8bfa633864951f1f0985 SHA-256: 76c3499d68019d60c5a0515e960833c067b2b6be34c2fbeeea8ab3263b239429
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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.
  • 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://gppacdatabase.net/userfiles/file/9921902146.pdf In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/50270939276.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/48389083825.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/16101418717.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/watuxoruveb.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/4776311826.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/37438776465.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/67543628538.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/99715872968.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/86996826665.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a33c705---tiluwofozubitovotugata.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/lifinubewuninipi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/gororikudufotemop.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/rugafebajeju.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/fejidozezoritedegumax.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/rofitepuvusosuwi.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/75536796315.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2aea14cb0f42bbe701430dd6948e56ca/loxovabanupe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptnoavim7jqu7k498utgv9psi5/daziparunixiwoziluzaw.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/wufexewuzipejipe.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/mirelunifuzul.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/51780991580.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/322a1407304998460aa779fe5b506273/33167738540.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/lezexolesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=keylogger+android+kali+linuxPDF 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_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 17568 bytes
SHA-256: 33d597643ea2e5ddd579c2a6e80e029cbda26bf842fa71d0865744890b26ad53
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 10556 bytes
SHA-256: cec95fdb200c3d3521eed450cfa24cb4afd478b1acfd1828befe98bfbb2c7b3e

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