Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b623ed1fe00427e…

MALICIOUS

PDF

86.1 KB Created: 2021-08-23 13:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01f482450f9e1bb6d099a32a324f9c30 SHA-1: 62125e9a8b03639e5a1018e4e2591a5f5cc33799 SHA-256: 5b623ed1fe00427ed39cf8890ef75f786dc671fa7af44a39ffe13568f6d3fd41
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f871ab308---dafuxikorugozilototi.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf785939b61---zibabepigen.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/49627373450.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35b671a0a7b8d50e5bb6f78ba4615bd9/rovepiduzinaxibi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/vuvorotivuwi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15355e1c3---85538627.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/19433173048.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/dunewokade.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i75rukhnj16p91g5prus9opob2/59939662919.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867d7f72b44---67335046239.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e472e6314c0eb9a3215c0d4b77f3e9dc/posapemepegasi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98311ba18---pavixovapozazosemula.pdfIn PDF document text
    • http://deauville.ru/files/file/bodorir.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pkr2vf3g46rt8vg0gc05a4qucu/27352457268.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2el53jb2i9g6tdmn9t3e2bbtgu/94078883040.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/balusajivonojoruzev.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2kcrkis212ab9d20p16515dqfa/wosawesexusumatol.pdfIn PDF document text
    • http://artepcb.com/upload/files/xiroverofinerabetovesit.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/49755041243.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/41066778863.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xafuxuvogujakaketo.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/52192031861.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v2840lc0ugcpbkg0v9gusmc6u2/4512322648.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/27291215964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=small+riddles+with+answersPDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17080 bytes
SHA-256: 873478dc7c8c2443145c6ddb1ad997a1e5c5c47b714c2a687b69049bb1c90b00
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 10552 bytes
SHA-256: ea625d81cf5777f301f2742c29846ed4180030d7805a28594ef40927af66a1ea