Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d93a2913870ca2…

MALICIOUS

PDF

95.0 KB Created: 2021-08-04 14:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2571af739c4b1546aba14c475156fd56 SHA-1: 160b5442bf8225f331d035e0a1a64cc196e30082 SHA-256: b9d93a2913870ca26e540ffa81e4cf087f9425050475e2e1535acad2bd113e6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://preciseenergygroup.com/media/29578190444.pdf In PDF document text
    • https://pasarantogeldua.com/contents//files/31199454169.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pv64a5eji7ep07s6bceu2o8hhb/46048886111.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/53323476367.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xuxalotej.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d913e15dc---30234215039.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8037d94ec823589bf86b85355d99e3d0/fedovibubagovivivemor.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/28523110121.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1c285d19d---52798638918.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gijuwizedavirom.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/befavekusipajalope.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e3b28bd8---pududakajokokalurolovagul.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/57t6bddl8lu15lk363quphdc5u/19986222566.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/20434858853.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93300565324.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/46140799318.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55035e67d---peboner.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/legegozudazodozugof.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caebc6664b---77040009110.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bb2cff2f---70499867263.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/zujifuzejofonin.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/13110d57ca82361c838a99c3e0c20c88/66797761207.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tisun.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/29933756311.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/13624720124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wheat+and+dairy+free+cake+recipes+ukPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16448 bytes
SHA-256: 58955451fbf3d79a2d4104956e8ce0f50efcffd0f566482135ce261e442f82be
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 18732 bytes
SHA-256: 61903945a906b421b382fc8ca07e5bfd20b1a2165e74c4eef10b0e2535838cef
font_02_sfnt_off00013c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001549d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549D 10852 bytes
SHA-256: fa0488e74e24befe85c0d12a2ee17503d9116c7f6c00775895dd589c822a89ff

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