Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a471bc06137fac…

MALICIOUS

PDF

79.5 KB Created: 2021-08-10 16:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1249942d82fe3c373b6aa59c9b2296b SHA-1: 3ffb0798a08f94583e22bf98a6aa1efe576d09c4 SHA-256: 72a471bc06137fac267d6c73e9aae52e6fad7c8dec81c7bbc0bd8c3be2d1bc87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=illustrated+guide+to+home+forensic+science+experiments+pdf PDF link annotation
    • http://studioarchperissinotto.eu/userfiles/files/33085819830.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/882c2025846429d69a6447452aec1faf/79882044025.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55e2881cc---52638418248.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/29668850730.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39e77b6e9---73270338542.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q5fqul45gisk4c29hqifpua3rp/viwigi.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/86231162620.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7e4983e---nerafobovufuvujim.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tebiroxuzemesaxixelijis.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/kozopodisamegidemilabulo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/48274347139.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6f4c97ed---10226439881.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc16ee08e59---mewefejebugusaz.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c802f9ba5c---35237757829.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9de5c7ea53a9a24bcfaaa4230fdce674/72779929684.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e5f7da9006795a012a5ef0c7606c1a76/90559648255.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f49b95c3a---40423472733.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fn5l8t8qirau503s64h4mt1at1/sotiwelowukubo.pdfIn PDF document text
    • https://anfauglir.com/images/file/jatamisinuvutaleluji.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wuwaf.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5k10r5tgmsviu5nr2n1u8e4l43/xatod.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14440048507.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/88195067688.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bfc910898cf5b005604e034381a146e6/91106791940.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/legefabapozinimuzakozuri.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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 11220 bytes
SHA-256: ffb75a06b30c4b2af66ce038b8a3a28c200ed04a6405ade14135cc158bfdf647
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 16460 bytes
SHA-256: 30384252e672103ba0f06124921085546d73893b036ae54f56eb5ac136f5992e