Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f11f82dd37a418…

MALICIOUS

PDF

91.8 KB Created: 2021-06-25 18:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4e076ff4cac8414cd08525c3ba033ab SHA-1: 640287d4ea40dd139645aa33078617d725d05fe3 SHA-256: 20f11f82dd37a4187aefbd54fe2fc7451087ca355e0db3414f2088b7fe8540f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e6ip805dg5eskjkfgb29a6t2cc/luvesetetekopig.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db105b018f---17045610040.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/96e61276888ea84aa8fc4ea57871a1c2/sigamozizogetenupos.pdf
    • http://hieuchuan.com/upload/files/74412240609.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5afde75ec1---wagujisemenoxejejujeru.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f01e600a---77666275575.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc43e7b887---rozowemudose.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f486f141ac---vazonoxanebonal.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/67072633807.pdf
    • https://isosklo.cz/uploads/xekagororusezojilosuj.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcecfbcb9df---31473067113.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a62795644907c49cab8fb1e3d043d74d/78644781062.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608872b05d0f7---wakigefebodozifibenufivef.pdf
    • http://meble-tk.pl/userfiles/file/xigusopu.pdf
    • https://alternativecarrepair.com/userfiles/file/woboxitogofubizemi.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/musunegilenedi.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf993448623---13517443859.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081423bd2da7---jutotigunisis.pdf
    • http://driver-jazda.pl/upload/file/kaxidaxexomazeki.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/wejenobogawisusuvizaje.pdf
    • https://daiichigroup.net/uploads/news_file/26302326922.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a287bf262---17396760542.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2a196e5d---gepubiximifewutopededa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+explain+your+weaknesses+in+a+job+interview
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d4.bin
12b6ee68a495e283ee1d87ca88aba2ae50526754b1b5b4ae3ea5eda5ea8ad99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 17456 bytes
font_01_sfnt_off00012ffe.bin
a192a2484c962dfd865756d5fd914af43d73d1b5b0bcb9bf45f94a4ec8ea62f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 11064 bytes
font_02_sfnt_off000149af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149AF 16792 bytes