Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef4bc98c283dd73…

MALICIOUS

PDF

99.3 KB Created: 2021-08-15 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ebe0c0ed8ab5de725b504c6916addb5e SHA-1: 142ed3192eb66a275abdecedf64e9b39990d7409 SHA-256: cef4bc98c283dd731129b5df46428d39f2b666cca05b1b07198f65c394830d3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdf In PDF document text
    • https://anhhuynoithat.com/asset/files/fuwexidagabujawisuvomazi.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/fobisunofumegutusupukas.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/794675c5ee6e1c271b0431a085484ffd/87274263232.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021618193173967.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/64818681152.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3b722441ad98cc76c39fb33ec6ead5e7/bekabivig.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/64726505900.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c80fdec544049a1ada7db1c32c41b0a8/60626734042.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6388c3f8c---bamovados.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/28788542730.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/3181260871.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/10394424055.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b4uqhv5iaje6qjfrus3b64solf/xegenezezifodudix.pdfIn PDF document text
    • http://agama-rc.com/upload/files/74247718383.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/24463147379.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/kafofif.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/koposefuzajopedodanoba.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/bigemikajimesigejuvunir.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/12381906088.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062118032580554.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xonoruto.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/51929532194.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/92277224055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bobby+flay+grilling+recetas+food+networkPDF 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_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 11136 bytes
SHA-256: 51a0cce5784d7f8781d28ba8a0739a9b1db1bbf19cf4a3743973d0b9d938c6ce
font_01_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8E 18336 bytes
SHA-256: f8ba108e0feaa37f7fe8dccdd22ff0a48c505bcdb8c2a63e7022df0a7733ff9d

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