Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cc4f6534b658d3…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 19:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 616e980ebebdd3a662394e76ad29df2f SHA-1: 9ce19ad0c04076ebcb63e33c6b3186cefc288ccd SHA-256: d6cc4f6534b658d307af45b10e3fc745fb0b94595b2f9978da84037ba65ab72e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external PDF files, many hosted on domains associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure suggests a downloader or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://latework.cz/soubory/47109020646.pdf
    • http://limoride.net/gallery/file/ragizasuxamokikilatek.pdf
    • https://kompaspt2.com/contents//files/64177368176.pdf
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/79477815011.pdf
    • http://camwater.org/media/files/dapepamejosuwam.pdf
    • http://mtecommerce.it/public/news/file/bepesexitati.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0c9492e799eb78e38afa4cea68e9432/44722117320.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r3trqeb7blm4hrcg0hsiccspq5/sorogi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d5fu835gicav42bqc7sida4cn0/rozuwevumewenami.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/353i1ditgkmm50kd0hv40s868h/13901031731.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a9a14ce0166eb09bddfb7278babe498f/kaxunizewuxotigamidenawub.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/27133537349.pdf
    • http://myshopekerala.com/userfiles/file/26204031531.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8v39u80fq5pmnsul26bjgaao24/farusenalase.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d659964634---47183771415.pdf
    • https://amatnieks.lv/pictures/image/14371053538.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/22790fe6aec4ee301e7144c6bf11c2dd/27080770787.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/bifufapafi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/52f91968ad1af39953f4e6a86528e043/66167718919.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78088008448.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2743ce6c71218b39b4ab4fb458247859/32686832133.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/337kh06gd63ukq2vlbj2bpt1m6/93620111044.pdf
    • https://alakharia.com/public_html/userfiles/file/32391006670.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/nokisamewejujufi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e458c6bb---niderusuletigi.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e75a195e2bf6185f69effb964163d458/vixisinitakanenejazozexex.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fbe334a9---70604540381.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=utility+mcq+questions+and+answers
    • 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_off0000edd5.bin
c5a91610e434ae69a1b3030ca2bbdcdecaa7bf57a4366e6d4a724a730fca9ead
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 18088 bytes
font_01_sfnt_off00011d4b.bin
99e85e95f6de0c93a659f91321f2ce160bd6ff1d8df21ecf4f1198e690df1e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10984 bytes
font_02_sfnt_off000136a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 16792 bytes