Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9038ce9d2e19c…

MALICIOUS

PDF

111.9 KB Created: 2021-07-24 02:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90a3ce433e32636d71a6883d1ea7733a SHA-1: f542cc82e62f656b88397fbf11aa1fb64c1e0532 SHA-256: 4fa9038ce9d2e19c0d5083e2850e82ed122687e1b74a81013ef4fa3ec881e9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm intended to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc009855c1---9641861776.pdf In PDF document text
    • http://designfromall.it/userfiles/file/10370768091.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/85528372485.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d3a3f98ib4fo1431n1et28kfo1/40099095563.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/99fb8130503e924473c13ab9672c6801/42927705490.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/54652652961.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xiponoruda.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/gisovasodepabilivomesod.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16096d96163259---92714084931.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609857090016b---29372801773.pdfIn PDF document text
    • http://zimmerei-possert.at/56289212728.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gowopiromi.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c1fceb7d912bbbc6276c0389788eb3bd/85877431795.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444ffe84e9---22027428223.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2d97b9a---nulanebefitipazove.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/vozetakadizimip.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/6934179995.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zeraloriburigusazi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60eaaca494---66234013561.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/63151510608.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d49e8c9cd65920562d04cb1dba3e64db/dedojivamuzesiwejokureto.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3vvf9hmbadfidcl8isgtsspk9h/5385592269.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/66092239817.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb76b077b5e2209dc0aeb66e2653fe29/rirafositifebadimu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/88b83c0596c023bd21aa9d7609bdfd59/66113360918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+mitzvah+projectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 17660 bytes
SHA-256: 3f4a4582d3e276a8e0a9402cebefff96daf1fc28e74dc91f85582a83237bc2bd
font_01_sfnt_off00016254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16254 10736 bytes
SHA-256: 100e6ab31ef7624b2d188df5d393661dcef8be483ff4fa5fdf329558dfee2971
font_02_sfnt_off00017b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B10 18324 bytes
SHA-256: 07eea3e946e99616d7c8d32d4e7a6550fa01e6a231daa514f13698059386804e
font_03_sfnt_off00019890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1