Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf28dca76aeac5c3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 10:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8a0093912a3e44265d0f99436f4d5eab SHA-1: 7fd0e1aeae41cfff721e76b7f5e3775938f3fb4f SHA-256: bf28dca76aeac5c34a5de5dfbf96ee30460fb8bce32119d88758e5fe3f612ecd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee30097acb0---fobawot.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a1ce40ac---getebadiwizobagepegu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42aed4e731---44412514726.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160fa17bedc6c3---zipagewofon.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16077c634b2294---fadisofekesok.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210618111959.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/rumimalakogonez.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be78ad991be---14107764450.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/3646392490.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/34637204162.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pelaposurunuvakuzozimomu.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/vufisode.pdfIn PDF document text
    • http://intergeored.com/upload/File/40544585256.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/30484719112.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/xajogogasotelowa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3m84t6o26fbp0ofdna7pckvfi5/96733132512.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/67360306966.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb82577d1c---kefejefemavitadopojipi.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/56169446349.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/pefokimanafuseludaximazef.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/60884168897.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68e5d8130---nowifitoxewatunobisaraluv.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/vajadikizusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nutrition+research+concepts+and+applications+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/63832809179.pdfIn PDF document text
    • 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 18240 bytes
SHA-256: 335f9cf951485c37717f71fd119de4d47a5a6a496d32ee7e7417b7d707f19543
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10796 bytes
SHA-256: 7003e765ea666c1f69acfd2eb841d575dae88b5f49f282ec8f80c773f5cf5438