Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5478e1fbf623175…

MALICIOUS

PDF

80.2 KB Created: 2021-07-09 05:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5e3ffaa8cd594631688ddcc3f37fe76d SHA-1: f07381c74d00ec4ddced65c48780d31e932bce10 SHA-256: f5478e1fbf6231759a594803e52c01fc2ccbaa23fda078e2bd63fd6b6ca50159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 multiple compromised WordPress sites and potentially disposable hosting domains. The primary purpose appears to be to redirect users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=small+story+in+kannada PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/786683496c1e4e5b4ca9198bddedb099/3916101055.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ad5c412d0f06ea5aa524dfcf006535bf/dokefewagugawisa.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/66452500721.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fecf5246e---94784299452.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f7fcdee2d759572c9bf750fc73c9318/sodisoru.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082f416b1d---62112682549.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2273ee51---fazifilojejijikixubekena.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eb472cdba30f1cbf74569f2b89a0ec0f/68659454760.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a02af52dd2f---96773265074.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608175715f7b7---7294622032.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be84fe37a60---12102652659.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/5631424649.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7862e875d---79042458701.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe4101891---xukexaveka.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/22455145624.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/35110075538.pdfIn PDF document text
    • http://alexandrapanayotou.com/web/images/static/file/80378987415.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/27b3fefdad5c32ead0119d9b399b7025/40835465150.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfd1i7e6nrnot13366vi4ug2t3/jifepuf.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2312d476ef1ea30116c724c75b7ba0d1/63916282787.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42da653a1---24880275282.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062502490522.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16336 bytes
SHA-256: dbac94fe4b426f6d0a33b7d30c493bf35e97bff4af64f8ed3529190d97c957be
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10556 bytes
SHA-256: b4757502233488dbcf5d7ff385a4b93839111859af67730a30c9c4dd47aa31d4
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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