Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918891e4f45510e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 02:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 977db5382c683002e55e6dcb9ba74507 SHA-1: 151a3864fabee0b323d1dfc5d0beb131ced951aa SHA-256: 8918891e4f45510eb4fa9275c4ad64a646813074136bc318fa5163f84e2c7d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern observed is the use of a link farm to lure users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mevidinodikogoluputixiduk.pdf In PDF document text
    • http://benrassam.com/uploads/files/jefufariruba.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/54ba653db230ade59340280e7b3c62dd/gozawisuz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc73edbedcc---92354821538.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/turoxabuvalizi.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/39670940961.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160864a056fb04---bomog.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/23870719062.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/85608000427.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/38209902600.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/memafoturikigoka.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1lndlvmh101n559q4gqq2a3fp3/99731516458.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/070ekq6f8k5i9lh0sr5gepcqk1/72501763043.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba760d3c888---63730756836.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/92503312993.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21465d7ada---razesezarawetoperu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a66c9a0fc---80932492935.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/19921609684.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/33632019373.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb1a9b6e---44385494683.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5vhdtnfr341sv0q23126rmu20/1265338014.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210714_3E5C993F2B854F04.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/10501973273.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/68679513592.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/kosepopabemilutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bharatanatyam+basic+steps+pdf+in+tamilPDF 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_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 11072 bytes
SHA-256: a4d6029789afd1eaa9c762aea2660ad67a956bacb265e00fca9ff69408aef2a1
font_02_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 18972 bytes
SHA-256: 61fe0a5e7342f11ca92b42ec5681901bf68689d221f0bf938f6a9651000ced02

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