Malicious PDF — malware analysis report

Static analysis result for SHA-256 2843e5a89660278a…

MALICIOUS

PDF

129.4 KB Created: 2021-07-05 06:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1060ebd297622918586fd2fa3fbfa3b SHA-1: f3934217d97ab544fec2d47663f82a7dae9ef68e SHA-256: 2843e5a89660278a4c7f8d7be288aff7d2514e9b1ba0e378973efc2ef89dff45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://condominiobrisasdelnorte.com/userfiles/file/damemubufunovizosolin.pdf In PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/28a9251540dbb1ec708a90a0c719aa29/95809513641.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/tenojomafekapusijalero.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/sudilawavefetipidikiti.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kixemafidegesubuzixaxo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a2c9a50a---panexub.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/xesewumerisirenifisog.pdfIn PDF document text
    • http://poorclarescork.ie/images/99089106503.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/deraluxim.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dce9e437e---rofek.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef98475275---45982412043.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c9c4dd1e18e91026dc7d5b54a1359649/41277686389.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160797de248465---3595809225.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/vfvilgbt9hmnq8uf6g1dfunkud/lovuzopatefepaxokexofa.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106100209178882.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11c556d1f---88437408046.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a37c845d31c1534974100c2a42e83941/tuvedelutepetof.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c625dda7068---vifomamebikasabuzu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/k2qrboiq38ur22avh6ths4hap1/kuwid.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a9332a3344eeb5fb882e2e0b290b3917/16677037041.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8bcd79f02aaf521eba91bc22c4070e61/guvubofaridividiwatix.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/9653853134.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e009a2e8bc---sevisusuvijejikadi.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/rusatafu.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/banevuloxazametaluzuxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+glimpse+in+teluguPDF 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_off00019915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19915 10696 bytes
SHA-256: 2952bdf11cb48a3b069f1732a9a4900c6b96fd7e8e253755452264f1689e3fd3
font_01_sfnt_off0001b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B198 17012 bytes
SHA-256: b5e2636325443627c5f23180273c7336cbc54e7d4e27e58832bd5d5785cc4f4f
font_02_sfnt_off0001ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1