Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e431ee5ff29243…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 11:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01f72fb5c100493a4a78fad6e1571a99 SHA-1: 46dd41fe48cc1c7184f2c153ebfe38eba237da30 SHA-256: 81e431ee5ff292434bb9a53a63b6d8bb57c8449f1a3d5c7040e018ce1ab79ec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mfcwestenkwartier.nl/beta/userfiles/file/63648829889.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5fd34a376---12369081178.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///sadilagoselojakevugexoke.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/p8kgvmm4cas59ld0lrp8752hu2/jupawu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dofutezugisilozexezesu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f834f83e---41929880277.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210809033810.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/kafamate.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0oer7vfp6dmutth426loiu98v/gajokajito.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/bemurafaliwi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e8ffba9ff---rurijamugeribuxanoxiwove.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/limer.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a4b37d4e---fawariz.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/xejuxepiwo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/63946932697.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611018d4550b5---17828886260.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161300a491f55a---wubewawazomep.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/68501585190.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/palubuwedaboxafire.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rojis.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/zavadedulig.pdfIn PDF document text
    • https://sy-tech.eu/file/51966054254.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/de2fad3c287f3d519c73da0bd94e9b4c/46009005091.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jomaz.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vavag.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979425ee27a---37256954500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=goblin+race+5e+pdfPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16824 bytes
SHA-256: 2074b89a98d0401122ae9d303a89e7b14a3984708198e582f77628b121539649
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 10660 bytes
SHA-256: c83d9d34002a500c9501f0a2da1b97957647ffbc5d2ec04e218b83037c544508
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1