Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed74e278edf6cb5…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 09:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b8b43a28ba87598e68c3f9be712b756 SHA-1: 8e644d8a650a14bd13f363237bba3bd415146e28 SHA-256: 8ed74e278edf6cb54b2130d6728eb814dca90fc47a30f3ae30f66ef4ec462b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing lures. The presence of embedded URLs and the nature of the link farm indicate a likely phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609039fec848a---xozovip.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c60d05e8f547c4fc478ffcac6b8d3c5/gozuvabidunonolugewudetup.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6babec629a---reduzadokazisagubeme.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a06b58287d65bb64ebe85a817afff08/39805910029.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/jukajusolarageravib.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cea4c31640f2eb9f4318678a1e8836de/madumalojetemelimewalumub.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u8gm08rti6d16hfuhp7nn7fdi5/vewomukuvakilu.pdf
    • https://cubic.is/userfiles/file/71570344318.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839dc525072---91602769288.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23e005821---18108733710.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a360f54e21---66012269585.pdf
    • http://driver-jazda.pl/upload/file/wizesojug.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7e1783e0---50145771527.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0892ebfe11---65091115403.pdf
    • https://12tiga.com/contents//files/34095353443.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8b0330cc613c1a0564ff9128eaef961/30240875311.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160873bca317d1---jukol.pdf
    • http://aaaexpressac.com/userfiles/file/funerorajit.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a1876c7012727d21d0f4df49ad7f424a/72900670590.pdf
    • http://aaaexpressheating.com/userfiles/file/fuxari.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bjbhvhmtvf48nefqsj9a7fldo8/patanigawase.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b486acd1d47---96969956605.pdf
    • http://artetendasud.it/userfiles/files/buroxexuvawadufenodelam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=possible+rational+roots+of+a+polynomial
    • 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_off0000eec7.bin
4b296727d8cf66d3366db48b4bd1636eacdc43331b2c8f2beff9749c2b8cf78f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 18128 bytes
font_01_sfnt_off00011e33.bin
8afcf97a41af882c9881d2439f9abaa4531b3bdf46f8d005a336897a9b8b447f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10772 bytes
font_02_sfnt_off000136d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes