Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e5eff4560207c5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 13:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76cd5ebcc331c7f775ae4908475027a2 SHA-1: c76a9fe1e43e9c0e0af68177be806848275d0e99 SHA-256: 34e5eff4560207c55739e3dccf8dd9909b1271769005577d0e204b96fe5cf069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, likely intended to host or redirect to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/65q0sh5qk4c6k5c60vvuu5vvd5/karixonupopezur.pdf In PDF document text
    • http://www.frank-diagn.hu/userfiles/files/2862087323.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/tikotakitegepesitodesa.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/selotej.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/buroresewanapemedaj.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/31170448398.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaba83f29---46255857849.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jiwujamiminapenedazox.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a10302bc07d6cc204772f37290359115/35652429098.pdfIn PDF document text
    • https://irrisyst.eu/files/file/nakuxukikofobosuf.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/98799804822.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/xufowunedawumodazu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lepotokuzizenimilexow.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/4449432245.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/76928938843.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613854cb16f88---74805182957.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///12776082324.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/87916137853.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613511829a9b7---17803267911.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/dakivalinerefulotojiv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac98c758e---merekegaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=prokaryotes+and+eukaryotesPDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 10412 bytes
SHA-256: 01cc830f29a74ebc9a527c68a92232b464cb5fcbf0132317b27a2ec325374e91
font_01_sfnt_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 15436 bytes
SHA-256: 0fc1614f3a200fc4f8a512f1addc9ffde02bc802821ccb4d0fa45ea747779c25
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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