Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f0b2fa626b9824…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 06:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 335f554463773f828e9e8cdbf800cf8f SHA-1: 16da50608940d7e680d6f3eceeda367cf7ddf85d SHA-256: 84f0b2fa626b9824ad5ff99d472da0117e332665a0db7366d227a81ad6f82da7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs, such as http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87fd4e3f1---gusozinijufixako.pdf, are likely intended to host further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a027739bc75---80857665407.pdf In PDF document text
    • http://architettogherardi.eu/userfiles/files/60198432621.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/filazojirujuniluvabez.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/23215769252.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87fd4e3f1---gusozinijufixako.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/didazimonaluza.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ac538jsgmr1j0e79tqfpakjhl8/93991897199.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/debimolob.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/dosapuvogudumof.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5a242578---1099291470.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gelerubivapetewafuwubum.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/o8dpke51lkmaq1nmp3bejpvl5s/tibaxetevobegogewonogupeg.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5eb0d3ded---jikanumimetatuwuto.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544f261fa---vonevokamefozemubofusi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1055a8e47---8860272007.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2ca04d16---78822087222.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dexuwajerebiterubawelized.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/43337628110.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/l4rjsusf5qf36e54u9c0iv0jjv/vujinudexuzunesojolabuxen.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/19239071764.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/kizom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nuvole+bianche+sheet+music+free+downloadPDF 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_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16764 bytes
SHA-256: 877b651dc867798cd7bf6695c2d15ffef1c3c6ab7603a42bf3a6b6003ab395dc
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 11108 bytes
SHA-256: 88a5fbe4594ba0670a69aac53be63e05ae7ffcf83a26af24fce8b2ef4a59cb6e

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