Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e533c3ef2da236e…

MALICIOUS

PDF

92.4 KB Created: 2021-08-14 20:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebee2c927d36b719bfc0311c43c51433 SHA-1: bfea54e0a7937c1e0ee73824389606935057efed SHA-256: 2e533c3ef2da236e8660e39318b6f2f67c2864e953b9d928f09a3eff06c7ae5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=what+is+informal+assessment+in+education PDF link annotation
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ziwagexefemikepewafevimim.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8c08dab81a4bbebb62a779f035f6ceef/wijukozote.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/38209334889.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2320c618c9d6b84e4401a7e9d6a2ba45/sosurasevikozelexetureja.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0627bcb65---28526517505.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/jilibamuko.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/jaxedusediredaxifogevuno.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/k0kjkifcsl04ra263jcm0g87hq/pamefalinigovekiririzofa.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd3b4635e---senipu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e16a0adf---weweliw.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/642a52d299e46eca2a1e6aa452207638/kejefaxe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e328a70e3b---71678293270.pdfIn PDF document text
    • http://biosite.ru/images/news/file/pisokaverejodokepuxex.pdfIn PDF document text
    • http://chieucoingason.vn/files/bofosanikabamokejoxinuvu.pdfIn PDF document text
    • http://sciattella.net/images/file/39289116282.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b672240480ee476eca170896f1f646d4/56298784612.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/50669005896.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/lakufak.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/9713728270.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/gewibagowutu.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/nevolawimot.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/patovemebojabi.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4t2k6ou3r67ebmdnng74spcef1/boxusufup.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/xivumuvezidareriro.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_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16680 bytes
SHA-256: 2d7c24b27a1a8ca5a993d5e11aab785cdc7c7aeb3ebdbe981ae90966fd6d9500
font_01_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A81 10836 bytes
SHA-256: 46208f5714b825ca5c4c1b538a3c4d1875d7cc50784f05294af03c200c55e225

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