Malicious PDF — malware analysis report

Static analysis result for SHA-256 c306b97329edf500…

MALICIOUS

PDF

112.2 KB Created: 2021-09-03 20:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72a6d91144f3856bb7eab8c0c0714950 SHA-1: a48ec3f1482a67461f06bd0fac5b26be31704d84 SHA-256: c306b97329edf50085d70f36a4f4e25f0b5970ec0ebdc3615f51c08be95d83c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crewmak.ru/uplcv?utm_term=singulto+persistente+tratamiento+pdf PDF link annotation
    • http://www.clc-engineering.com/siteuploads/editorimg/file/zobatimulotofesidarugal.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/11327652456.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/67114944116.pdfIn PDF document text
    • http://fygl.net/uploads/file/210858098444.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/bored.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/23031278814.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/liboxumojarife.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/44650590723.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/nurekujazojaxawolulosizil.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/22396980096.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ed789bc27---robewexogabamimolidizedaf.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k3quqf08psbm4hss3mi5v09eh3/rabav.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/28235957435.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5nvou1svh1rp7ukt1pqgpe1861/55242124218.pdfIn PDF document text
    • http://gotween.com/userfiles/file///juroboludapovufuvoji.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/94404019654.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/57af9708b92eaecd5ce954d479ce9515/31858787615.pdfIn PDF document text
    • http://darstin.com/userfiles/files/97592439695.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/92697496102.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/jumusoforawejirug.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/63067217913.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/45806478455.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/41335125482.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/82451220547.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_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16204 11016 bytes
SHA-256: b85dfc4a63a09e90e08bce20e51621e55c4990fe2b261f14cc79bbb40118e8bd
font_02_sfnt_off00017b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B64 21760 bytes
SHA-256: 5ae7222f4f60da71dc4159173930ae85560104995629a0c52391893a834f7631

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