Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bada17922de5a53…

MALICIOUS

PDF

97.6 KB Created: 2021-07-31 21:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b8d085601163404e6ee79fd4c5bc0b3 SHA-1: 508b481722410a9676b15d62e7a27e879f7d6485 SHA-256: 7bada17922de5a5313363a8a42fbdaaedd4df07c7161e2f157e3bd582ed0e5c5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised domains, suggesting an attempt to redirect users to malicious content. The presence of a callback lure heuristic indicates a potential phishing or tech-support scam. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lightningriskassessment.com/ci/userfiles/files/48029473696.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/devasenupexerabez.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8655e516bb---34189999661.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rpnldo72c01ln32ob4mp1i1dk0/57895049858.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/92626217191.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c1d815188330d53d8337a7e71b9fcb70/32295630871.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/64507827768.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b3230f50ab13340962b0ab9ad9fc3979/4568629236.pdfIn PDF document text
    • http://adveotec.com/img/file/10373764016.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/87341771553.pdfIn PDF document text
    • https://kar360.com/resimler/files/33333921706.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tifuzojopup.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/95914373088.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481240c365---38785084551.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f11b68e0766e39365d27b1b5246e0a5c/gakidelogu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/55314283070.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160857355eacdf---46625143145.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/67171070974.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/97156f64c11ec78c978437521934b3f9/wuxuwakogudinatekopo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/gurigutuxagisudawoxobobo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nhgdcqkfmhf4lj8ove03063lrq/kituto.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb217c48f---89924402078.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/wezapute.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160789afd3affa---zosapagujakisosovefuvigov.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/ninoruxubidezawo.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/95196179643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=roblox+loud+id+codes+2019PDF 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_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 10748 bytes
SHA-256: 391d01bdbcf188d057889cb3c09d177ffc5eb65827224525f137bda483dc92d3
font_02_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 20656 bytes
SHA-256: 566eb2827a18ff717b3ff68f683b99810c4e0ed4d5de7ede4e8ed00ae35ada80

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