Malicious PDF — malware analysis report

Static analysis result for SHA-256 23456b392538c69b…

MALICIOUS

PDF

96.5 KB Created: 2021-07-14 04:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f98e7e92036a8ff74fd6a4eb1e1cc02 SHA-1: 29b6ee382189ed9880f237e347c92ff4f9e40704 SHA-256: 23456b392538c69b8d9924d1483d581facc7dd8dff887ca66f7794c45c7a3daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://ekolojikweb.net/upld/userfiles/file/vorasujeluwif.pdf In PDF document text
    • http://evohome.pl/userfiles/file/ropumanukatezasikurekakix.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/11387345890.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/bujav.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/984713729.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57376397299.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be43efd3d90---27231347086.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/db19oiv5trgh40m04lug2qn5fr/8656712591.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/titozusobupisukadifefew.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/rufurirujenososan.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/10357c1edbf3c8b3df12420e75dbe18b/44203038707.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf091554f---21923701340.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zazanuxatinuzi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadfbdb8c7---nogukuxuzateroperi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/56482935220.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/16418318870.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tatomibonusumisowi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1278752c---7756911750.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q4i2dmrj8g4db3raea7edef8nl/fuvibegakobibuxupimun.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/895039816d12a26cf8bd198aea414152/53615230492.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/80e5f0fb75f8a52508be4c9310111fd2/jutudex.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/sefudanuvegati.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081abd494cb7---26227214675.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210713_BF89A933C4383EDC.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/womidexapalexeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+number+of+atoms+in+compoundPDF 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_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 18236 bytes
SHA-256: 80a9192bf77ce99f00c69c80ea936e7ac4b17018bc885490357fdb541cec24d6
font_01_sfnt_off00014302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14302 11052 bytes
SHA-256: 8325fb590d366aeb7edb2cf3d2ec4cd10d34f6eeddb08faf21fade24c1259bc5
font_02_sfnt_off00015c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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