Malicious PDF — malware analysis report

Static analysis result for SHA-256 349c0d571856ca7a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81619862367f13fc347c63558c8afd4e SHA-1: ade81238670fe77eb715dd44a470652e05f0675c SHA-256: 349c0d571856ca7a2bfff9bcc0d7a4783420dbe9814dfb6ba2e68d9fc1388338
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with numerous external URIs and links to compromised CMS uploads and disposable hosting. The primary attack pattern involves directing users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=nervous+system+disorders+worksheet PDF link annotation
    • http://rld-carbon.ru/file/17142897382.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lapuvodajozi.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/11524008877.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s4i118pk03kblj2qc5t0jeqiig/34606596381.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/winovirivoxuwonu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/65843250482.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c4e2c769---2508201895.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/timopemixexaxasuw.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210517234727.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rca6701tgdi6hbllbv1dnsfnt4/razusa.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kikukafotajikosimoxinot.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6046f73f---napuso.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/42967448163.pdfIn PDF document text
    • http://fructusartis.com/i/File/78323768664.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/55092679157.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/55749287000.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pegakusulolorujisitoxidux.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/xijokuxebezasonabijato.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cac343da---50688739178.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7da2b2da75e09d3e19cd9b85668b2df4/17973972483.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pnj6noi3cllunh20da1t9n0ec0/39291167882.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1713804f10---zitemerajixina.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6fe057c877ba9bf5d582f8636a42e9a3/lejemonizurizetado.pdfIn PDF document text
    • http://axwelindia.com/uploads/5588205902.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/fuwulejofitoko.pdfIn PDF document text
    • 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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 10636 bytes
SHA-256: 42c221ed80ff9cf480aa28ec36d270a04a83ea549b23c41df4dfd41baf8b792c
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16856 bytes
SHA-256: 0bd78f8f789a0e2ffc9bad67742af5385d3a0a4137146dd3caf25c5252fec4dd

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