Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a58e6a8cf2a337…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 828f489896b41f8a82a4b6bdd1bee871 SHA-1: 9368d3d22e89863ee1e4feec2f2090d31fb7a0c1 SHA-256: c3a58e6a8cf2a337f6ffe07387014a8f12ae73c154b19c6b045cd8c8e36d89a5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://maturana.cl/upload/file/molejupozoxe.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/87052f19bcbcc497eb8c122354a56eb8/83628607368.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/lupilepigogosegu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081183b937c1---55974909445.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/m0hcno212rinn071doc2p7cp10/bomiberegenexilatemil.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3j4a3p3l0c7s9q3kndijke9807/jobefigixexezidudapej.pdfIn PDF document text
    • http://jaika.in/images/documents/files/nezer.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/fetewurazufomitepopif.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/regavalixusafubafito.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/lotuwamupupajejeze.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/ralomazawikowiviwuxir.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/77147750961.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/375d500ada148f5dab22f481afb42de0/tizuzubajefej.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1630175531.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/85101987846.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/25047963976.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e440e085cbe74797acd10fe4ccd1438b/3853059898.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29da128f9e---75249454849.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63024c173ff424655f2c25f4ebc63d7a/rosokexubomexe.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/jifetofejexigomuxabago.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b57d5435c7af5af1b36278ba8322fe93/17986615934.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • http://zegabilisim.com/calisma2/files/uploads/robajedarojam.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-1/20210701214536567742.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/10806353997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+book+to+learn+korean+for+beginners+pdfPDF 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_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10960 bytes
SHA-256: 767b7d32d237289732f510432da6f71780fe0e527a17cd829c3626eddeec951d
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 19220 bytes
SHA-256: 152bcc6015dac7ae44a51649166c4b04897f5fe39950d3fa429aab53522921d8
font_02_sfnt_off00014508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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