Malicious PDF — malware analysis report

Static analysis result for SHA-256 072a77fb4c53ae62…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37b9d4f1c623d0c951d38b7927c59c06 SHA-1: 72f4784be32c1cfc56268ad923b25ab4bfb0ed96 SHA-256: 072a77fb4c53ae62ab575fea8b47c7b4f0bd1e93c787a90e643dad000a54a4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161440f1773b06---zekukisoludosujin.pdf In PDF document text
    • http://hiniceshine.com/upload/70428849820.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/29696446829.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/wufobu.pdfIn PDF document text
    • http://thevale.us/userimages/59049359448.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/21496447221.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/valajisarasadufav.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95fc0de8a---kamaliwu.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/26890926707.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/60278033349.pdfIn PDF document text
    • https://cet.sk/res/file/sumame.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/216o9reiemofa2u3qcbim02voc/59224521519.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/numasituvaxolu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/01076tedqkcpbuarsdns57ad6a/fananegosevudopan.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/89741967461.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/gadojuvebozizop.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/surinarabemuwaful.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vixaduledubutovakij.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/85911615883.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee8a7c6c28b8d97d6307117a3e2fe196/mufaxunirobizuvet.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/16070466350.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/96639927006.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fokog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spoken+english+tenses+pdfPDF 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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 10684 bytes
SHA-256: 56a23b90d284545e14228f5a3ec9010783b2824cf4e4e65a0c581fb7cb0d4684
font_02_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 17788 bytes
SHA-256: b0691acfa2682e0279f9697fb0046d1172ed7e3dc6d148728e89094d03d4b1fa

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