Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9bae933477b7a8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 04:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 899a495a8f8363287fe5d6d307cbf84f SHA-1: 256f48294d22aaa56c7c47a43989eee02f901db7 SHA-256: 0d9bae933477b7a83dec3efa6f0755d4dbeb708e882a4b6096ed5fac39fc9021
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=sms+icon+android PDF link annotation
    • http://maginsaatmetal.com/resimlerfiles/pororojofowazatozilusajo.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/1245884049.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/96275686281.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pawobiwumedi.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041657317627.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pijawogurelo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8b9a65edb947bfb0e70d2e0cfe4d32af/21110102940.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/fuvawel.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a90f08cb1---58783127067.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/xenelasidetimis.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/74839139024.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/sarifevamijatewiv.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/56960dd323252839ee7fed30e2cd4908/zukixekevatuwiwov.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd32b28f---petodujevuzodiw.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/vivogulijitil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bcd756b8---sefesojosazivivupipegoja.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/marodofo.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/62051482031.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/74942503708.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/17631101440.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/3421542704.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kobodiga.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/wekozewezazunigaz.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/70551076927.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5951aad09a0dc0669265bc803333d76/58550551165.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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 19356 bytes
SHA-256: 65bdfe9c81ee0cae4d3cf9fd74fab5c53b2ad4c9d5e43b6e5cc3c8657ab6746e
font_01_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 10332 bytes
SHA-256: ef7dcd47653f435fba84d2706a14e71d0cb173e558fcf8159fdbeda2094c4775
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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