Malicious PDF — malware analysis report

Static analysis result for SHA-256 9488d63097cdb6d3…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 11:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71c5a5be145b3dc9cbf3e386b4bd0fd1 SHA-1: 95bd62f5e0ba427ba5540e01e054e03f98a910a1 SHA-256: 9488d63097cdb6d380a8b7634e55960b6c0598b4e797b97d07f0c10e5d4fd9bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=exact+first+order+differential+equation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/40410378294.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/79b9710ba8ea052a7c6681d2b6b3e131/27611437561.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acadeda4ab---mozobajanaroxotu.pdf
    • http://www.rify.us/cms-uploads/files/89078932474.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ppp6h7jv69rhtbukv8eqkmvv3j/54418360042.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8aedbf9acfac584a073bf11eb7ce352e/89929684074.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/269eqjett2qajbi5nhaumq6hf9/kopulovekoteranisujeju.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/vuuti3dsbgh44fjupdiepjiq3c/pexivoforupasuza.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608747e262119---sewisubusoniwixubagar.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uep5mhbjdn1gn1q456n958bvga/bononozebik.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c454ea5afb---tesotodutoguf.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609993960d725---lakufavemiwixow.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cddaf11b---89792315943.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec5bfe4ebd9b886b3acddace64199c75/7604768422.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/86978847666.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2b56b05364d2a5174eb168d4f7e3a96d/75031126604.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c54a1369---44160526895.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4d4b76b9---linuga.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/62770967703.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c34df1d2a---70576751610.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609125a0e26da---lakajetagotezilo.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcdd0d675---17180846364.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/901282449fbe924a1c222b6f6673b9d1/56511540279.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4a5c502eb22038a01bf84e6a09e9fdcc/jigopupini.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/89d5448199abc5de7d875663aff2ec28/gabirafomupavogexudo.pdf
    • 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_off0000ea20.bin
35489471a2d3870c0f4e14a5b0270bd629bad5396d09befa2845d1e91fed3822
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 10800 bytes
font_01_sfnt_off000102f0.bin
a6152ec61a2240af21d676d335a01b99fb34915bee14889d81654e65a904b1fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 17168 bytes
font_02_sfnt_off00012feb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 16792 bytes