Malicious PDF — malware analysis report

Static analysis result for SHA-256 081356d615e1e711…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5cabe7b167ff346929df008db937ca30 SHA-1: 2f094b2838b970cb028fc52d7362d24e7651993f SHA-256: 081356d615e1e711188f0f7ccad9658b3ffa8a5075fb002d77b1411d7ae35eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting, designed to trick users into downloading files. The presence of a 'link farm' heuristic and the specific URL structure suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://migger.dk/userimages/file/67290906873.pdf In PDF document text
    • http://vimar.ua/userfiles/files/60797077472.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d630820730---60275963663.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/53b801eaf8f921cd528e451999c37eed/maloxawakupovelinirerez.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608289f06b2ba---23456116065.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160773d7ebee6f---26777272325.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/32920673730.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626060126.pdfIn PDF document text
    • http://topas.lt/userfiles/file/gabozaw.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a3eb66b55ec0974833467ba291f20562/64993722823.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/getidafekifazavo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/rezojosenufuzewafubop.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735a6760c5d---jajoli.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iv2b88i89t8rv1mko5e4k4qo9c/56772517962.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vimidusedafotukubowonek.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/2669193375.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/55105392606.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b651bd78---21530358503.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc9eaa7d2---jeragexugejapixax.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kos3vtq0j4ol07va0569njerch/gixugikifurupilotefuv.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/kabajomunapeguviku.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fcb38ef4---sunoromesiwufijafuxi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/kibavofewoxubadixedaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+dungeons+download+free+for+androidPDF 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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10832 bytes
SHA-256: 65410f3327d3fcd1871c01484e6640da651b6dbfb3b92d9cc4efd3d4ab139261
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 17320 bytes
SHA-256: 7e42fa975f6f1f3f610473f16886169c6c720cfe93f689bd70a720aebd1b8237

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