Malicious PDF — malware analysis report

Static analysis result for SHA-256 9500d9ae65a4fc6c…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 19:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 663fcc36bccf3e7f5ef96c7935215e6b SHA-1: 2a7f0653183e7b4457f878b6e637edf068c196d3 SHA-256: 9500d9ae65a4fc6c77c76b7501c0e509c3400995afa3ec305dad7c73f2194f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, likely for phishing purposes. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=sql+date+from+timestamp PDF link annotation
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/vizosubejesifuravidubuvof.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210704_084352.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lh360v1hsigvt7lkg8jgb32nin/89586747980.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/wunizumimolufigusak.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da37d3e06ec---82415547954.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/xabuvori.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609eddf33e25d---bofapuvenilezojikozizi.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/besaradedovudulapiduwazav.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc383d2d7---jejesavezosivule.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mqomcrj2utm4378gfvvng8thlt/84753843922.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/706613315.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc2cbce16---4543725658.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c9a38bbf0281cbef79673afa7a7ac63d/26963351246.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/lisuniz.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/90472359126.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/25781310313.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7052f917741d0ea3159c6b292bb1e699/73971097270.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/50690add8749b203510223447138c828/50913324919.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/logixonalaxo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9382b482a---85642144926.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/nivagoxebuvipolixara.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/47833678965.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 23896 bytes
SHA-256: 192624ed537fff2dbc40ffafc0eca58734b5d9cec3bc1019bebf426e2ddd3ebf
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 10776 bytes
SHA-256: 6aaaa1b21d32dcdafa3cc2c7e84ed9d061ee4c85d23e6f33746db3517dfb36c5

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