Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d190d4ea121e4b…

MALICIOUS

PDF

130.8 KB Created: 2021-07-26 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c4574fa275e5248e29e30ee0225743e2 SHA-1: 0b0970a2431a42f6693f4f2a01cc3e22b99ef59f SHA-256: 61d190d4ea121e4b2c37680861eb2289062835b55ef3be9c0897eaf1eca85d08
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8396

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://westernstudioservice.com/admin/userfiles/file/temipebuxokuxikagad.pdf In PDF document text
    • http://lyjclinic.com/ckupload/files/63056240153.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gotisafikibavebujujo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-29/20210629100202580042.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/wigera.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/547c290c16fa27b961ee0388210061c6/62772664347.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b65f117c4---pulewewewekipixe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62666ffa7---40600889115.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/33f15e3232aeb70d6f174aa9afe91b71/94451740933.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2b4a7428e2097a410f1d858767e64b4f/jajodifu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/k6kgobvk76l7uvks04g07j5ssn/kuganusofivofupoporuza.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tunigotororogorakaliz.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3n0b0d478r3c5qeg3tqliqn3u2/sowodunor.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51ed309a7---zuwusiwuvugevizosoxudew.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ukfmdr31h2i4hokr19r2a8edo7/70056750874.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/zisowir.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/5355444387.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/24195996968.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0d1167aa62c37a3cd691fd09972780da/90396147883.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ce9505f9d55a68d386d1b3c76435b3c7/kizesoruzu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160967016455d6---74275398906.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/32566456907.pdfIn PDF document text
    • http://esistore.de/userfiles/file/83838405387.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0ce7dfe43d7d04eef29d06f18313251c/68518790361.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745448463---83739134615.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/12989ab2fb3e9094fdb275ff5fda91c7/vavis.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/86039305187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gu%C3%ADa+integrada+aplicados+3+contestada+pdfPDF 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_off0001977e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1977E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001af90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF90 18728 bytes
SHA-256: 0de965096ac5e7af3922d743e04efbf894ccd5b648f07b9b20a927c5a25123f5
font_02_sfnt_off0001df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF02 11168 bytes
SHA-256: 8989bdf79acddf492da7718939e60a863af10269852758d492215e1485cb279b