Malicious PDF — malware analysis report

Static analysis result for SHA-256 5029bfdf0f43275d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 05:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cd2d0d186e1e09d55529c07ac4d3a4b SHA-1: c5f48ad52fd75441c7c4f339880dfc0a6efca712 SHA-256: 5029bfdf0f43275da58d1e5bb5711da4c915c769d978e044e9a6aeb47ca09601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious elements like duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=add+persian+language+to+android PDF link annotation
    • http://cpils.com/userfiles/file/zarirasijupedeniviveder.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3c51481b8326f9660377d5d76417d18d/89660342558.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/27346839143.pdfIn PDF document text
    • http://greenld.com/userfiles/24358357462.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/gexaropovenakifo.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/58738900249.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/32218557529.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xedowuxejuwipalabuw.pdfIn PDF document text
    • http://saktigroup.in/uploads/29775016269.pdfIn PDF document text
    • https://highrise.pl/file/dumebewa.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/45396435994.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/kivufujewo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/65167602586.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/donezudunozabufimagodobi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qojavs19ig7ltpruu6pp8tdsm1/lajifujufabaxuz.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/9653825687.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/divuxodewobiwudan.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/roxifowigubesixejitudol.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/64441129185.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/12407081447.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fijelosikopapakad.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/4015436492.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613659233e1d3---josuxer.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/zadajigusesazizufil.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/28028933997.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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17392 bytes
SHA-256: e4087111eed760104f095d830945cd4cb0b90139a1fd6a930ec565ddf7708881
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10648 bytes
SHA-256: 2543c845e9480237d5ca547fe75ba810715df45a2547cd9baf5fa8fae2e645e2

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