Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff54eb3b0be99af…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 05:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f56457afc17927414bfb088a1553b07 SHA-1: ec012910145223faf9b45a93e60482d91998c462 SHA-256: bff54eb3b0be99af76f4f6ba1e071f33f946038d05ffcb595e7066159a6b7ffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://agiusfuneraldirectors.com/files/file/nejefowawaxaz.pdf In PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/kegive.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4b4724b3---37658944160.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609055e32f972---83549855722.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/67928574857.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/53106621711.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075bb8d9a09f---11310528225.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/wozafalegepirotejosazab.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bikasadedinazawuga.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904211722.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/noludigav.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/655e6f8e56f64c918d1f10f16669b292/milujexajimutomofuwal.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095860179d4b---leveserapowegen.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/25800017485.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/rilezimawarogugodupi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b79bbea89---ruwumifizusokebamota.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/60870914316.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/66932976630.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/15017275717.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/bl4b4304ha7b5u6c07uf6no3qg/36041137792.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/44106789303.pdfIn PDF document text
    • http://fwullong.com/upfiles/editor/files/vejuxadigeronep.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xomijoxuvi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/89029316238.pdfIn PDF document text
    • http://jngf.cn/files/file/nidonatukabadide.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/zebidugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pseudomonas+pgpr+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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 18256 bytes
SHA-256: 07f701967b8f8403099356801a40a49daecc7de7cd59d671a5386292aab0de10
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10704 bytes
SHA-256: b6b32f3e970f5cc084e1c9b4fc6927073643a8133eb929983b7cbb61306bba63
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1