Malicious PDF — malware analysis report

Static analysis result for SHA-256 af662b5b379293d5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 01:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dc5e804ea84aa8677c25ae924a313c3 SHA-1: 38b11b863c6b9ce2cfd6f954a9c9535109829e57 SHA-256: af662b5b379293d5fd0c929af55e4ff5329ad68127732801a629124d84dc7ec5
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 domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://permanentnimakeup-brno.cz/userfiles/files/19878653176.pdf In PDF document text
    • http://mkngsp.ru/upload/files/39600598187.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wawimukumi.pdfIn PDF document text
    • https://areicon.com/images/file/kekojejudifuxizemuxudomu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///fodirowobidexa.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/78296282164.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/85768809360.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/finuzi.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/reronodazolufudez.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/131252572fb926e18b9962b83106e4ab/84123174633.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zuzetebijova.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3afbdd23d9---66715963691.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a262f6f365d---50790167771.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/26256630245.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/87199397078.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/janipokemadotisuve.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/602111f78186d28dcfe9ea957b47ad65/4135601369.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/fedabidatigalirekelufij.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/87543615976.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/99866924247.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/548998bc64749a96af1b8323af37308d/kijadimegazuvu.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/10108977168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=el+alquimista+paulo+coelho+pdf+descargarPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 18532 bytes
SHA-256: a891d47ef77128843c04bcf6c2eb9e7ae23648d639766e96313cddde1b946377
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 11192 bytes
SHA-256: 7f1bb5a3f9e04722131019c0a921cef3e0c56ad4d3389ea3372821f495f709a3
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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