Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbe05b4a6dc4576…

MALICIOUS

PDF

82.1 KB Created: 2021-06-27 10:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 12bb28758c50314b1d4f104cc29e1826 SHA-1: 469ad2a4739832952b8bbcde30033f48c2481782 SHA-256: 4fbe05b4a6dc4576b56ad7f1ebfa430a3e498b971ad98c0a2b78a81d65a4ebe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaa0ccf3b7---87478989224.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad211c5ce---55025751037.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/87770105566.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086847c2bdd4---60165376073.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/53df235158fc7812ef30300d1b1662fe/mulitenirizazuvefosetetu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/94860074119.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a522e692f8c8beb50ac840d926f00f4f/18166798740.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4fff39208e21c597bcd6ac9a162a13d2/99464202051.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tcc0atqtd5h232vbomo85sjv83/20301267158.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/31381826690.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/mukanogurigipagutaxiba.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf2ac152d---sebupepafixim.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sq5sumb0fh2u2smcjrnc34ffu4/poneliboju.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fdrc6g036nmvq8aem3ibt8nro4/17864608358.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e85e1fa818311a99855234d10f93cfbe/vojovuvabibusopojudal.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cdad31d87c63d98bfcb3c89e4e7bda7d/lasexi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3tbii9u1tbvln01m6tbtejkrd1/gobisoxobew.pdfIn PDF document text
    • http://momsystem.ru/public/file/gevoguzunux.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a543e392f5804d3c838e58ba39f45135/livojisari.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e96dd196700db8dd40fbdac805669b33/81616025172.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92aac7902e4074a230f2f22b9c11ee59/15190970743.pdfIn PDF document text
    • https://bdcomunicazione.it/file/sidibulemijegokaz.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/17007871073.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8be92261fdc2f8d71fe92ec804d7bf7f/12410096987.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/15789398036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=whooping+cough+incubation+periodPDF 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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16312 bytes
SHA-256: 422605facab342cdc3c544eda047121488acc553847adb6c3a9a89dc70512e3c
font_01_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 10812 bytes
SHA-256: 64db6807bbce8b565e06686292c3eb8f1ba01bd89585bf28cad94bf44c6d5e09