Malicious PDF — malware analysis report

Static analysis result for SHA-256 5183754a98b3d465…

MALICIOUS

PDF

94.3 KB Created: 2021-09-02 01:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4583b00efec720dc02fe13452574fe4b SHA-1: aae00f23bcd0e56346b1fc85c00f21ebb4619732 SHA-256: 5183754a98b3d465ef444e8bf723826b67bc296d92734b2cc2f84c46c6ea6dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. The embedded URLs suggest a phishing or malware distribution attempt, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=anthony+from+ink+master PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b4586caaf39e5fd555ea4cb9f9e87925/61024379439.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/gazemedixo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab849d2380a---8872428379.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/31784384961.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/71258413652.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69c6cf08ee---fokudamafebogufinifemadox.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/revimojad.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/77297420612.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/gomotogudo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/mamujeluramamirotomaf.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/49ca0d96ad5c06fca431956cdb6d73e6/rimugibogop.pdfIn PDF document text
    • https://sinarwaja.com/account/files/72561204770.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/92190165384.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cgqt21d8jobssi1nfmddvabmb4/47638764715.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/3943713438.pdfIn PDF document text
    • https://anfauglir.com/images/file/vasowebofidafafasenobow.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/pupenixepimofesaguk.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/16863294145.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5751fd431cdb31a69c7c915aa2ed1844/38429709480.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3279551f985d5e68651d962d642d6afa/mogonimukiri.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/rijilalan.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/97a08ae5ed43150b753f10892e1d674f/vetoliwawowibose.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/52202377867.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160778fec9244e---zenazovulilakurekat.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vemafujogesogosewujur.pdfIn PDF document text
    • 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://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_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 19536 bytes
SHA-256: 117a75d089a283c27f4268068321731b1769adb7c04932c310de3febed31f26c
font_01_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 10620 bytes
SHA-256: 860a5f5ce2a9a4b0000ee6b1cf3db210303c23dfe0c58667e6472c7511438846
font_02_sfnt_off000153d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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