Malicious PDF — malware analysis report

Static analysis result for SHA-256 7353bba20fb8f590…

MALICIOUS

PDF

71.0 KB Created: 2021-07-05 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 52c19a9c59bf1a7e96cc9b1984d39dbd SHA-1: cbb0ff976aa2a4153587d31ac0387c294f8b7db3 SHA-256: 7353bba20fb8f590b84b3a2449de4e5736a3ae4361f9cdf16340e3eeb55ca609
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sheenabusesandcoaches.com/userfiles/file/fopekuwaf.pdf In PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/xuzasedatusafop.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff31210a9e---32624017482.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3601d48f---72245393261.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/64262138453.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/51i65cpgs1ehe1gblpae7qqse6/kuliberejigamopuz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c515e31fa28---filozevumorakonubare.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/zuwuf.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/10398753523.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/bewidiwiralos.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/92131714923.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc69fe305e---fafarutipevubofenijat.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ucghgr2nq329aob9cctlrrfc4r/pogoxama.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b69eea5bb---dikonanodezegu.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/79751667263.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d78b7fd9---90887737532.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pgsi4s432gasl5meqp6n50phh3/voxamibodujagi.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/13845310386.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/25686729528.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8408bbc304b2f20e996ee5808fa7ffcf/72139470426.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e998b01ab---rititet.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b0c23846---36689650153.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/47231521971.pdfIn PDF document text
    • http://artepcb.com/upload/files/fadefupuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=blink+tipping+pointPDF 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_off0000b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 16252 bytes
SHA-256: 5f6aa9eaa95c4f78c8f51555b006d8bd21050e11b7cf0c9063c64ffd55483699
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10008 bytes
SHA-256: d3910af9e2e90a95d1d7a0d71c4cf755dd29ebed0592aff869bf15479a142911
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1