Malicious PDF — malware analysis report

Static analysis result for SHA-256 31907d5a7c94b21a…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 14:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4904d75b2e1abdf6e7a382369c0b34c SHA-1: 7b07af51d2537a36cf8c3bd05e36ab8eca4bb802 SHA-256: 31907d5a7c94b21a9b9507e88016d4e871ad79cfa6e27c3be703e445b66cf80e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=tableau+periodique+des+elements+chimiques+complet+pdf PDF link annotation
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/56572375627.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dirubavibebutazujiwamo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f91962a8e5---13056678621.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/52e57c494c8b8a46e7a4a1ecb0a6ca2c/29518833379.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/289e87064f861e7fc6963f60d779b35d/palin.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/sugeropukedalizewakiw.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/ruzelavumitixibunazinu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/vopodosotexorokusu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/abd0f6fe03dc8c1c5704f0c76bfbcd2b/lekotakasivubafol.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc03c4199d---86418199598.pdfIn PDF document text
    • http://www.asslar.de/downloads/43833985577.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24607979e8---lefivate.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/34985889519.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9b0c500391523235f15941f912428c2b/kazepeti.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/10158443657.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/kupodejaf.pdfIn PDF document text
    • https://laser123.com/geektic/files/tubamafilizagiterazer.pdfIn PDF document text
    • https://mollis.rs//files/zafoterivubiwenunezivu.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/92307849411.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607693212bce9---mujosomimepifutumemo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lobosaditobuponetuperaso.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/au4inkvh0mcfj3d7kf9encbdc1/44835612526.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/309082617.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/boxitovokulomisata.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bc1316f2c09ecb801329c76b5af8363e/22671247377.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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 19908 bytes
SHA-256: f51e84b0799d8558e6ec7ae3b7bba38648060d56d3441339a4388f653d44101a
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 11232 bytes
SHA-256: fad540b4abee868c737ce56252d9d8ae5d2ee8f326a470e91f5fb2f35be7f5ff

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