Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c91e1829b440ef…

MALICIOUS

PDF

80.1 KB Created: 2021-08-19 18:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ead23ef6eb0024f7ecdc321b2ae6e3b SHA-1: 3345807fc25ba3e41f5e426bbee88ee09f516fa7 SHA-256: 96c91e1829b440efb557f4f96372a3d3946f7fff3c70ba2e63e571c55399731b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to lure users to malicious content. The presence of a 'download button' heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alexandrapanayotou.com/web/images/static/file/mofux.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/89096889904.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/kipugomukup.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b087ccec---40762107088.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9b8e718a---zupov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc7d25215d---guzapexezepedukuno.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vugabokinejarovavowuxofe.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/dopufiroxaju.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/93716935034.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c0ba3e90a5776d0a61c2e36ce26d64ef/84182394451.pdfIn PDF document text
    • http://thedreams.cz/files/61613212729.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dd8ba7466---65677098015.pdfIn PDF document text
    • http://temple.mo/userfiles/file/pikixenudipifobojoxux.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/linamisave.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de30719075---76298175688.pdfIn PDF document text
    • http://emannsltd.com/userfiles/pikonoxelabalate.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/32343841471.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/02a3526fb57a7f26fedf9508aac7ee3e/kaketodubegozupudosip.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/jutotawerurukobexaviwopi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0bb20a5d---pigig.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/240ca1b4606cf9617f33bc6ec54435bc/nidigapebosoluzoxowuvib.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86f868f16b---76402825458.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/mupofub.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1362d9d886794cee18f47522f2d9e3fa/jabalawekuzanoga.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/55dd7049689e2710c1e84f33468fb12b/3992689837.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/suraduxijaxelupobefidasab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+tag+team+2+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_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 17512 bytes
SHA-256: 22f504c29985a790eff317a57215de4aed33482913310c52f9f626f7945063b5
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 11248 bytes
SHA-256: 5098980fd63ebec76ecf68d5f8e285992a36e44d24f9642fc4731117bcede75f
font_02_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1