Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11243251ba0b649…

MALICIOUS

PDF

134.5 KB Created: 2021-07-04 01:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 30bd98becd8e161ad3559b57195e26eb SHA-1: 58262fcd2229e0f84c3732b5f835251370d6fe7a SHA-256: c11243251ba0b649245c1455e9046c1a52ed0d20ad16b0047ab775c3cccf774f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, some of which are hosted on compromised WordPress installations. This pattern is commonly used for phishing or to redirect users to sites that host malware or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://philabc.ru/uplcv?utm_term=anti+corruption+meaning PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4jimli3c3o374o27pfv6vi51gj/50400631689.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/dunoxidezavosiji.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/25439786913.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7953a5b0---kuwib.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/77307049543.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4ca7cd570f500a8d89041abb6775c038/puzif.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be087c88ded239bdc234b7004c2165a5/fojuwogerafawenudiduve.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/xeradoberufumuv.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/53c7f6bae72bef2daf56d04b5ba9d78a/85645374580.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gupagijefuxoju.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/77517750318.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b71f3c9d---16385364681.pdfIn PDF document text
    • https://amblamy.ee/upload/file/5747962146.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/ligalosaz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051617445441.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dcfb3063f5068b2cc5cad2ea8e5e8ea/59662147680.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ef479dad---10352469613.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/81f3a72a7f636c772ee68cde64061ff2/58036862585.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4db49083---femusizojubadomu.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kefodoluvejodujotijepibeb.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/eca215c86e5th28k63kplnr8kj/sijola.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d0fd3a13c0c796eb8ede2518228b8ce2/48539912458.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zoludotomikepekinati.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61b558edc3---gevepijiges.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_off0001a8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8CE 10584 bytes
SHA-256: 4ed726e56e16315147ea0deada63911c8435de611963349a7ff12ffdb5315cfb
font_01_sfnt_off0001c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D911 19592 bytes
SHA-256: 232173997c01e61002d2c3d70489dc1241c463f6636bb4d0da69665f9a29b456