Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337b51d0703a7c7…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 12:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcf3386e7eacbbba10040b4511b4d596 SHA-1: f2e02b5ff9a21d65ca109d771dc33683b14f699a SHA-256: d337b51d0703a7c792b17cced8e4f337aed20996064a095f0a1d2a95bec8e36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the PDF structure itself is leveraged to host these malicious links.

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://archism.ru/uplcv?utm_term=chinese+novel+read+online PDF link annotation
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/35184457330.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tixebavesojajutotaxoz.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/tipewowezoxokinu.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/9500108793.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/73356343862.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/fejedizilikudu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ravat.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/9495068264.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/94614798227.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/rokuxodebitoxanumafete.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/90114406531.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17391739946.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8d1c580146d06a4e30099692ad3e7a21/82257596407.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5b7275cf5---20390202902.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebazegolaluragokoboxozi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bdbc14ed65bd8cd99516edb7088c0fbf/80213083795.pdfIn PDF document text
    • http://sartor.ru/upload/files/gevinuxitarawuzi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146ba4d708e2---zodunop.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lelewumejefadiwe.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/69180794974.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/044606552aa62bfe32f84375bd2e5e02/xefax.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907073154492631.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142a355829af---gapiguzenipevomuvagime.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/jotafeboninalak.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98c814710---91844778865.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 16536 bytes
SHA-256: 38789d8d2e9883479001e8e8d6162b1912e2a855ea5b3f5114773e40200d282e
font_02_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10344 bytes
SHA-256: ad2ec5b4a7fa91cffe13aea06fe7153087e44de0adc5b34a49c072f895be940a

Open this report in the interactive analyzer, or submit your own file for analysis.