Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c873d183eab6019…

MALICIOUS

PDF

64.0 KB Created: 2021-07-06 07:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe1aa3afef4ac07b9d2db89beb57a998 SHA-1: 22a0e7d34eb77dc3e6063a6129f7473b48c0412a SHA-256: 5c873d183eab6019d4daa96ace85ce96c031db3626000dbeaac20eff11891332
174 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to compromised WordPress sites and some directly to IP addresses. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7605

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rvms6dluuohb7mc5oga51567ba/masusebaluzegexode.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd355043c3---5162978075.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/lalexivuxufegizez.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/58241097162.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a2311b90974---17705290372.pdfPDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/43be3247bd3bb845f72edf920bee9a9f/xejowinakez.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dudiwizezuvulasenu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e98ce77ac---nesigizamukejedi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/89035069170.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/resuvufanupusinabibit.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/latabaniwositoru.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc8778628---firulumunoda.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/modunajixotizusuzodoneto.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f66308752b02e6882c3e7f83853dde59/24304637815.pdfIn PDF document text
    • http://geose.ru/userfiles/file/fafododasukoj.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18444648910.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd7c0413f---belewudufigugerakalere.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/58539084900.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160750e35b6619---zezojat.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/bivobavune.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608715230abbf---67375627701.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078249635ceb---17061987896.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9fea85dafacc55fdfc2f9a64f073f18a/tinibabamadidijipozaxape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=leprosy+is+communicable+diseasePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1