Malicious PDF — malware analysis report

Static analysis result for SHA-256 211d6cba9b7c035a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 09:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fc2473972fcf0268204cc3a07872f83 SHA-1: cb46058501be704d503f3d0df32469d8df9dc283 SHA-256: 211d6cba9b7c035a2ea6b16127f29b848a0a9cb250ca75d5b9a989ea8bae76bf
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coyada.com/up_images/up_images/77342946203.pdf In PDF document text
    • http://biblioteka-belzec.pl/upload/files/2747909908.pdfIn PDF document text
    • http://dgjst.com/upfile/file/furawadogemilututena.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092adc2cca---mewunalepobowonow.pdfIn PDF document text
    • http://protok.pro/upload/files/pukizovitofat.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6fb3b18a---66778319620.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/20508035724.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d478852112---7179741974.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mn8j2i2hk5d9pvmlq26g4u101p/34249986569.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2b3f33d7093ee4dbc6fa0cbd18dd29c0/begafizimimekinudani.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/bifejulugu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/550dd79f82ef85c2866a4fd0dcafb4ad/depijode.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/684c6d2d20803baf64194abc734994ca/72813079237.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/be42418c07cfa6a0d1a98596af4001f9/92693211672.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608def63a510c---99543096577.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/71126423336.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/puxeboma.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/57456670467.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689447d313---tuvuxegubivukikupoxe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d33c2cc9---muzojuzotumi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9488c8c7e0---44616367320.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/79872202527.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11252612105.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/96259908376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fearless+cover+taylorPDF 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 17748 bytes
SHA-256: ded27e0c8ecde0b5e8b24339b4fbe87dce5dfcb8c3faaad2037018495f532016
font_02_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 10184 bytes
SHA-256: 2599ab8a5b7e052000f999790acd89aa46aac7cf1bcc31ace36bfe0c6ca9a12e