Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d93be10c2334cfc…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 07:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 122c0520f957b0828714b498af986d4c SHA-1: 439e049eb8053c0adb77d81bac8c60bd5a622fe9 SHA-256: 5d93be10c2334cfc3ee9802953f8037d97f1ff155d8b20094be432030abb5f87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://labonscafe.com/userfiles/fakomuzab.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1bc53cbd1f0b6bf5c155177cb8cabf0a/wiwejis.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108170544115940.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5596ee03df76810a88e74224ce126ff6/zetesoneselizowomazarofan.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9581a1ddda---juxenosunerevebube.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bd60f1dd7be04ea5dd207227f28f0673/84452573481.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0e693bd3---fadonep.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/1161537140.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/diwavopijepozas.pdfIn PDF document text
    • http://nfc.soo.jp/file/14008327516.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/1090681178.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hian4bjbq91m4s2013s6dfj3l4/64998238831.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/munewaz.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/49760119879.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/vuzaru.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wopixi.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/30029887361.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/53052701762.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/23087150793.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/dadejorusekagebobe.pdfIn PDF document text
    • https://ka-base.no/images_content/file/vesuvusotikupata.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/46822934041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=regla+de+ruffini+con+polinomiosPDF 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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 11012 bytes
SHA-256: 9a78a0cd73919b7f1f524bfd68bfdb9e6302f5259e994160990f033f27e6a79a
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 18716 bytes
SHA-256: 9d2f733ce06bc1e871c5787bbb0dec5343018e3b5ff3e48c50ddb5323489a43e