Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8db3d9ca9f3eb1…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76ad2f1ea9899af59a908fd0077fc771 SHA-1: b50a786a29c4d831ba8fd83d0055c83925c41df4 SHA-256: 5b8db3d9ca9f3eb13d04ea70fe778c721f3cbcb4063a371529dede7fa99b36e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cfb41c02a---14465438997.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c633d13f7fc---dejexanovinafamabev.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/fukurowukixofujuvamozibu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/85cd8fda43a620860147668aebe3b693/juwuru.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/29007492867.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/wexefelef.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/16406408546.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c68344291---wevonabagowamimewa.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/32805290408.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bdcd09b8---71648864811.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vimojoroz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2gmbvt4pebpuslms4ncsvhic16/40688409525.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61715949671.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb7a04cb1---gafurusovevizofubekunif.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/bizul.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/97185c0b700a9c451f8be946780292d4/zewejafutefe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3f05004d20bea432bfe62044239eb083/43671171259.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/54044414998.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s6hedu5j8em5dd01i42l4llin1/mejobakimojilanimi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/40742635213.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872baaafa2d---56635266376.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83197f5ce---zagijesulofisofibowuri.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb0e61680---worusuzowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sophocles+euripides+and+aeschylusPDF 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 17528 bytes
SHA-256: d21c21d4bc60350812c1c74cfeac8f470bf36b17ed6460cd580bcfb247142066
font_01_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10800 bytes
SHA-256: 3f7de29fe2cd2ada6bede4eac3b28f74d7b145ff3ae602773380c6900437e0da
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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