Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e99d233c7e1fdd…

MALICIOUS

PDF

137.4 KB Created: 2021-09-05 16:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6594ea6126049e857dd8b5831913285 SHA-1: 4ecfae9e0867ad70897d3222eb0ffa9c20c2bcc0 SHA-256: 39e99d233c7e1fdd3666d14d7930e57c3e90eba2f1a0907a9c3309562a728f3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on domains flagged as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://appletechsolutions.com/userfiles/file/jafesosugorisipugu.pdf In PDF document text
    • https://kovosluzba-praha.cz/res/file/99164878834.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770114ee7d5---tisazepupuvupoguvomukakez.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/futepaxesuv.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/97369929792.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ae7b01c5---makelonoweralepelatorase.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/94249280693.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/18564406618.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b938ba7293a---14526772730.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/41793378315.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/21287219062.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/manabo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/rokenotifazitusuda.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4a5c502eb22038a01bf84e6a09e9fdcc/jigopupini.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160985dd7ab831---41364143997.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/derazosedikovomikuwu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0icm5b39purhmph81c68tspura/mowezofokomuniguweme.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210813210018.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/faveba.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/2061905964.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vplf6ku8f9mshmhia7uqj6citg/xaxitusexurobajogugu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/66050051194.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7975aa0b---zukobazufupofawinaxebix.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/94206313643.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b46cb5194---kixaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=romazicon+davis+pdfPDF 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_off0001b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD43 10576 bytes
SHA-256: 8c02f8fbdfd9c11029a9ba2eb0b9d31b6e7c5a720c2fe9cf407130b88a27f182
font_02_sfnt_off0001e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E579 19356 bytes
SHA-256: b8689330ac095da693f2b1a57ef922901746632f9d5afb6ab6605284e9b089b7

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