Malicious PDF — malware analysis report

Static analysis result for SHA-256 8929b6eb0e03ee93…

MALICIOUS

PDF

105.2 KB Created: 2021-07-05 07:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 693dafbbfb364c0fb780f8773d9336f5 SHA-1: f8dc685d5963067c01817da5d92c45d4eb33280c SHA-256: 8929b6eb0e03ee931479932584470ff4dd3939269cbc4141375f295836c81c4b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to exploit users by directing them to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://agendatourvietnam.com/hinhanh/file/27383502398.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/iih52rhtb2jtgcphkjokt8jvb6/lomuboruxo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e478b6174322ae7a480450da4e5f0d41/lufunefepumijex.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dc9c29d8---20620140860.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/80257497762.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6827fcd8---lezofal.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d88c958e2---74384736767.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/golokirixeresaxisumaj.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c36cb2839a39548183bcc073aea0c8f4/fafokufoxedogeju.pdfIn PDF document text
    • https://bataretak.com/img/files/file/gusabosikarivetog.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d4d10905f81c5fadbb27481fb64fa5b8/lamonitatonigekerete.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/zukupisomurudisejizezip.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9db65a737790c9384e3431d4c67da3b6/warazugeriwolej.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/92688705028.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417c59a3b2---zafobajutalajesuzilibe.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dabuge.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/db6647f71a20ea7851cbc30fa81f1559/84960432755.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/tininifidavidodofad.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/74109712112.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760ff1019be---31329691670.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29b96b0322---namesemuxusukuletuwonenit.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/00b1b9b76f48daae420bf75def5b7f99/limupovef.pdfIn PDF document text
    • https://puntoagricoltura.it/file/38828681332.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/11067655492.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/22778790552.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/147564838b46b73617b510f082490478/42785353107.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3728ad35---92938163181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+places+to+visit+in+julyPDF 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_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 10728 bytes
SHA-256: 9c213dde84a7175a0116c21567928112c80513c2f717de08e733fbbbec05a4ed
font_01_sfnt_off00015402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15402 16728 bytes
SHA-256: 32fae30cd2f81d73972e352961b69bd05476b62f82aa1d8a32356041baa69349
font_02_sfnt_off00017f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1