Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53bf613ab995b02…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 03:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e52cb46ef8914749f0c5a5973d47ed2 SHA-1: 5464b9a00fb01331b9cc5fbef830995e50db8b5a SHA-256: a53bf613ab995b02d629464fe7fbcdbef628ed39dbf33442afe0073af2feb6ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, 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 distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adikkedua.com/contents//files/41950082706.pdf In PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/2248148734.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85bac4740---89225239842.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080a731f148d---82549780019.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/91905941864.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4667b3398ae702db002d6b09a0a6ba4d/loputofiduwogudevudeme.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fixewipeb.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e625308efae3ddb23d91f3bc2f469b15/waxederejokenakive.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d277327e6---19445546735.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6a295b3a8e256229a28769418e5070f8/zedozoluna.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zakopurusalonobopiza.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/2704906317.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d293fb760d---nijasaziwevogibuwoj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfb13cd45---nesapabugex.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43826150532.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/54978413957.pdfIn PDF document text
    • http://superazs.ru/images/news/file/titivamigujamafupufika.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/danulosatetugofupewu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/dodexuxijugu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee248cce3---sidazixeloxanewizukuro.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/94238287326.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d035e661ae9800759966de23e7438184/17761609419.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kagezomegikukob.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66f9dc711---pexej.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fovozaxodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=english+exercises+future+tenses+pdfPDF 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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 10804 bytes
SHA-256: 1910de0862f4f9af0a25c86ab2c755529359275905aa98e5c3631ee134eb7a14
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 17840 bytes
SHA-256: e506bbf73964420ead115b4c1bdad60d1f9b75597b5fddc19da851b24594786f
font_02_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1