Malicious PDF — malware analysis report

Static analysis result for SHA-256 deff4ec828eb559c…

MALICIOUS

PDF

82.0 KB Created: 2021-07-20 00:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22d59b4e90b089d156230ed3bd95bd75 SHA-1: 4fdccc827c79fff52e21fbaec83e436183964dd8 SHA-256: deff4ec828eb559c070a6793de13afe196770a466fb640d83c6351c81defd49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, likely serving as a lure for users seeking PDF converters. The presence of multiple external URIs and link farms suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o7cpsoant2vijon1n4fv8i259u/29754731468.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1497a8a8c89effabd594b59e681a355a/surivevam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbb61feb9---nakipi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/80787576245.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093af2a0d814---39170313277.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160968bca13175---54869219527.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b94c71a1---lawibibozabore.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b225afee2---16309494324.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/82504981840.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cdf18cade9cfbec374c82e363f62f43e/80429351329.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/52ccbfe64cc7071fa24bf22d0b6f3684/xalenox.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/du9tsh67ktjttc35ok8bhi0ff9/gomavoridukiputevanuwivit.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/5931240830.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c648f1df075---71781617960.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1401_20210520210648.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/euk0uk5od0uta2jg7p03302v2u/81777055655.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/10390023319.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/ximevanezopubaba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21fab64eb7---80968289336.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607628116e60b---59697492569.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643320252e---61920423571.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/75672640509.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524045825730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=picture+to+pdf+converter+free+downloadPDF 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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16964 bytes
SHA-256: 88de6475df508037abf812e9809a0a8e48d5b17f6486fcac96dde5f608feee57
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 10700 bytes
SHA-256: 3a085ec10d250381eb6dcecb1c141d55749d08efc0122a28b9cfcf8fbcc5462e

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