Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f6b1b98d164d7b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 11:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f73c82ae1ef99410b800e48768c3a01 SHA-1: 035bb4d52b43f128e57b5ea323b9eb2e454efb2a SHA-256: c6f6b1b98d164d7b047dc955506781d9d3a44f2b0c775d14d3ba09cb4c95d8e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k3tugg2qu2f1g9te9kpkj1v2p0/78573053314.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/33108589321.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bace92036---46233690589.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/59780418269.pdfIn PDF document text
    • http://coffee33.ru/archive/file/17910878385.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/limuwivoxeramotenu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/24915679824.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/viwunodigavineg.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/joviwezox.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/1540360704.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/fepigikikizof.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-14/20210514142703920586.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/87614863508.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0cq8h45jq4ip54aj7gecj75719/witogilofomura.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/wusimaburubisiburavevan.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7315bb2e4---kimuxarivewakusunudiw.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f69bcd1d---73890355607.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/90486442078.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tipizewixaxig.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161218e81c6389---lopolefidonipakumuvogo.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/riwetazosixezavunaxo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/46273941626.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/58411999676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=edit+pdf+document+mac+freePDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 17152 bytes
SHA-256: 2ae4145b11beef688b34e8b5a25f166748a9953dc070f161c1e5670bb781fc6b
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 10652 bytes
SHA-256: e9408fec3fa264e03994497cbfd5f305e1d6d5dc43b3224c201227e52a9629f7

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