Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8868242a5b47c7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 18:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da0802b2e994829048c4b458b1e9f20f SHA-1: c94b260b45c664b4dcfb81fb69b9bd999fd0af56 SHA-256: 8e8868242a5b47c7e6c2aa5779a6ed9458133062e5e208e762a38a8aa5da4522
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous URLs pointing to PDF files hosted on compromised CMS uploads, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The presence of multiple unknown PDF links indicates a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/348a94c6f012793aa973841c65217de8/nunezovovemuz.pdf In PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/poxapilogapuxajopupixojob.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/wokijolakiminowore.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/dazisizogufixuvizapu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608024486725f---46808021912.pdfIn PDF document text
    • http://exima.kr/userData/board/file/12185758526.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/lusewaturazapegivikepen.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8ded46be19a46d9ef292b8f648f37845/8742316877.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c1a3a364c84e424d87b50b40da39cbd9/89061222811.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/25823286124.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3eef092a---regijelafexi.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/11056427671.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/gotonegodopaxigoma.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/42fdbd862174f559f44debb4f2c45019/40175098794.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/88551084095.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bbdd18c---dagisalewuwanevezemexef.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa10d44a2---24492458508.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8f5ec14b454a19425c18afff300dcb99/95424350228.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c1a7e776---kujekowarawu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/981cdb24d375902693de7c8a6d0bec52/sivobu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rcqes548p6mge7p1kdgk0qhkm3/75398191734.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/33295275163.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d23209ece---kiberepo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14d286c07---jusigezegejagosuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=walkera+runner+250+manuale+italianoPDF 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_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 10660 bytes
SHA-256: d44321fb9f3f4bb8787d46360da5ba53361672ea1b23a0ea1563192250686d5a
font_01_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 18580 bytes
SHA-256: 147ba0a016829aa3e5e18564e2812047cd6960accabc68359f1144137bac14ad
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1