Malicious PDF — malware analysis report

Static analysis result for SHA-256 055adddc169f5a98…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 13:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a30a6e47607cbf72b44710efaa3cf39 SHA-1: 40630cf9c60e6575bc5c8d101e1c3d8260cde999 SHA-256: 055adddc169f5a988c873f5b6facc83d8aa1c86db6f7c2d8ebe970f388ccd0c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://nomylo.ru/uplcv?utm_term=calls+blacklist+not+working PDF link annotation
    • http://lammermoor.net/imagenes/file/45593391367.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136050b3837e---45747771338.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109011059041226.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7b26da03cbd6a5a4cff66fa15b7cdce/75978212862.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff454d0f65---posudaralavo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/88611554149.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c348ebd73---59694170394.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/11388073936.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/14273265006.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bijusadekunu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7141cbc28---56791584783.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/um0pqufn328ejvjh4s9tr9lv7u/texexigol.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fonolaso.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7965753a---nofemepirolilopikiw.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd735453f---9466753152.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/70612682690.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/foxubire.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/37449768406.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xadakigepazizovofarawe.pdfIn PDF document text
    • https://websbag.com/uploads/files/remakedawadoxuniz.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/miramixiwobulikul.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109091520189649.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_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16292 bytes
SHA-256: 68b7a19a2ccd25f00ef3aa6b31f774ff1ac2139002de28ee882e526c84c6ad1b
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 10624 bytes
SHA-256: 7fce93ea1f3d6931e5e7e682c354acf61a4c1af43fb402837b6f810818eff93c

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