Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a482930961ff1c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 20:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64aac6b161905fa2aa00d6813b69c867 SHA-1: f7c8a48a73efeafa43d6bae9f3a16a724a840f81 SHA-256: b6a482930961ff1cf10e145a3beafbd6871f53062076471dd60b0b120fe1dfb1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and a machine learning classifier. The 'SE_CLICKFIX' heuristic indicates it employs social engineering to trick users into executing commands, likely to download and run a secondary payload. Numerous URLs pointing to compromised CMS upload directories and disposable hosting were extracted, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=name+the+first+general+purpose+electronic+computer PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6bf855271d9536ca31d1e688efbd9aa6/wuruwenibavetalat.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/18ac81095933ddec164334d15c218002/33837602964.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/rirum.pdfIn PDF document text
    • http://gewald.ru/content/Files/10239243835.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kokipewot.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/laxejeloditazubirin.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c3237914---61100042410.pdfPDF link annotation
    • https://snqrsl.quebec/upload/editor/file/wumup.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e631b9cdd1f---dowalexaxuxakonoka.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/koludekomumimugor.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/sobaxino.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bdc54683---sijafesomezajiforej.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/boxotazar.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/9522603048.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607696b43199a---firalubapa.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/96393633941.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/17832438806.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/83821135518.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d29ae7ca69e1b7f3e852b022903fab9/72104705807.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gezubejivozuro.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/29392683855.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 11004 bytes
SHA-256: 4e7754165202cff01c044a6763fe910684ad90c26b39243c9d68ae18dbccdc4e
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 17612 bytes
SHA-256: 75e436185848df4aabfeafd87b931b59632436ed4c28a8a9507f40f474bfb538

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