Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefe2fc77afcde64…

MALICIOUS

PDF

83.7 KB Created: 2021-08-30 04:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c56b19380f2662c6f013ec1d50694a49 SHA-1: bc519f749979de2fbbe0d0e29ca9ab29f841d7eb SHA-256: eefe2fc77afcde64a812737495b78825e0a49e5bc6fa34c5ecb711dd2cc5cff9
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, some of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to drive traffic to potentially malicious or compromised resources. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/99555376954.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ed98e4d2ed0011f29d278a9eccf7ea3e/63166525015.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210806_135209.pdfIn PDF document text
    • https://egca.fr/userfiles/file/moxeladesimufiguwegiw.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/losudutumuwuzuwip.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/93679840963.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/girumufit.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vipibat.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/zuvegujerosurugogete.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zulodawipanadaxanilasi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7bcbc921---dizupuvodamomupidifasijen.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2606055aa---40105337732.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88572f562---bagugereneve.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/lulezugazogenofakatiruga.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a27af152d8f---riwituzu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/51b3ed872ef96dd64e25b96e3f9edd3b/2172336857.pdfIn PDF document text
    • https://kawanmto.org/contents//files/wawururen.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/na86bbpomqrspj1e45p2gdndl9/51823804406.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/rozewulogor.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/setirozujebasakavudibaz.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/82044681486.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/20140028123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=citizen+online+report+writing+is+appropriate+forPDF 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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16672 bytes
SHA-256: 2bd70a2094dbf4cf6588855adbb55276e538325b7527c5197c8bac4235329b73
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 10708 bytes
SHA-256: f26adc7259ce063ef19c89ffbd30f128c7272229cf27b260f1297703c95d7a7e