Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f81a946297e96…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 08:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78c72c4a8223e3100ca5ba357c5c021c SHA-1: db58268c957ed37f99bf98adf7008102aa215eae SHA-256: f43f81a946297e960ba3fa76a2c19cd195af4efa92f3738e370dc5d00c1ccdc0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute commands, likely to download and run a second-stage payload. Multiple URLs point to compromised CMS uploads and link farms, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c771ac9315---19015419472.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/83840969993.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gegofu.pdfIn PDF document text
    • http://atiksigorta.com/files/lukofunusam.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/69863499242.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/9922152265.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/7297282676.pdfIn PDF document text
    • http://classtool.info/upload/files/99123987394.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vasajagizixirigisevo.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zufujepuvenabukipotabur.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/73728401430.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/62686091233.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b616935205b---14463817587.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960610316d8---37479855391.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/83338327610.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c8cs7819q4dkheaudja52kfngs/76197290124.pdfIn PDF document text
    • https://123natura.com/stockages/files/galevisezixogirap.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/74228123855.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/xokamexigoxoniwiponedo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ehbl39h1i85cgbfc5c4q9vo15j/82830985867.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/kowugujipetixo.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/lakufexafosulotov.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/mobakirogil.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7adef592---javilavigikali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+upgrade+dedicated+video+ram+on+a+laptopPDF 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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 11000 bytes
SHA-256: bf6f48c759c19a0de64a793a8446f2f7df1d16dbdada48177b439f3a07ab369d
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 18120 bytes
SHA-256: c420887f0e25e34e50518e2ab0f23d54387f106fdb590e6f56c78fe0aeb3c493

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