Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c9caa5ddc492f7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 19:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8d655547aef010f2215ed3c249b9bc SHA-1: 0811575e82d370a5e0a12e9ca5445975a4155724 SHA-256: e6c9caa5ddc492f7bf98dd8ed094a58ddf43e363a31f4b5d643b387d65f57d39
156 Risk Score

Malware Insights

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

The 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 numerous URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one URL further supports a campaign-driven approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=new+game+android+free+download PDF link annotation
    • http://195exim.com/datas/files/vufegebasetevoso.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/40414797565.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/126e353a105126b3e57d29e6cdf5d940/8018818986.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xurixumerek.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/11884726178.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eadda2466---mutonizowuku.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/948388259.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16039822126.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e28afa43---13787056662.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/17151756503.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pidijo.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/gekarama.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/70459336000.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/nizevavugujo.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79882712815.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28955705824.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/85907466891.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fojilenasofuvuzetojapu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d63b47d2---dosegevononixo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7g6qodp764j5h2u4dgadt061d5/77437790289.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/rikujejowuvofobuwuju.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/miwewatafugasa.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/19384588767.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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 10492 bytes
SHA-256: 4217483569d76fc4c7b08b45791756a9f975c1f0ce5992918437d45e7268f472
font_02_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 15152 bytes
SHA-256: 460d9654eb5775662a0fb3853088813f11fe267fe23cf6c70ab036267804203e