Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f21d3dac4e2344…

MALICIOUS

PDF

85.7 KB Created: 2021-07-21 21:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbc2d52e9e5348ccabe752095ad78205 SHA-1: 13eaa04c12ed92da8d164ed06438a7935db7f9ee SHA-256: f7f21d3dac4e234410e54b9cac4bf0196aa70486f60f5a7df16c40f399bb4df5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4834880fe---tugewe.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mdhfdhp24dstdqes9j5cf64nc7/gewopegu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74ee13cee---32128159088.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/ragudil.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/mixesemumosavum.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/47336040510.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c6f8856d8---86290297384.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fefbc12ff---16547305119.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fukopuxupotokeroluzom.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/74373043054.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2f25057b5eac6e4ae75cadcd413e0ca4/91029715958.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/409480483.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zogevarep.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/sudujewosatineleto.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/59109157011.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/3532606952.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bukuzurafojagaravilevuwis.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/79960875143.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106020144406110.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/napibadut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=prequel+effects+%26+filtersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b48998c9612e4c60587304cb5f3e47ec/4263432279.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_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10100 bytes
SHA-256: 3aa76fcb84cbb64a439d0460c7b8a583b91d26b397a0c61d01d26a54975da708
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 17748 bytes
SHA-256: 758b7f6deba8db23cc3c2a22e149224c92b2fda225c44e2216f0f99fe86feac8
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.