Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acc04c37ac554e9…

MALICIOUS

PDF

76.1 KB Created: 2021-07-24 19:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1812c21706de601c04deec64b0417ad0 SHA-1: 5cad5e818ab6a1467eb4d5ab84dec87846cb7d2c SHA-256: 0acc04c37ac554e910022417037e40467d9c0c0dff2a716ac8cbb704804c40b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a link farm designed to obscure the true destination, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/naxuvefezamegas.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e36314b2---44000919779.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/fujewurek.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/56118249947.pdfIn PDF document text
    • http://yoron.net/up/files/xevewize.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3bcf48bb076c83508b4f07103000e296/27097495013.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/0ba246754e6d52f92b839ee44fb76808/turigavowenolazi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/70889175206.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/bumipavigizejumofapo.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/bomizarefitonifesig.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c78b24801c5388de311b145d25769ef2/bimolizonufasotole.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/mejeketelowojaxuwavizina.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lepagudunetapusikomajire.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093ac9296b40---gazopaxagoxapa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f6af8057c6421ff606666d2d1579a44/63989913164.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e955791bc---zerabebebomiwerodal.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fatepemavosubu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075453c5a439---16915333037.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/sazuselaraxixuv.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/boranasobatafef.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kotitapekepaxep.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dffa63d9f98---nozefonujop.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa59156f05---paral.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/98523169358.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803658a77b6---89352875718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tetema+rayvanny+ft+diamond+platnumz+mp3+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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 11052 bytes
SHA-256: 7ed2b516fd2d04778ddf82baa413336394fabf85b4577392fb45ac5ec90fc31a
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16088 bytes
SHA-256: 85612f4f46669891bfa3523bc30a5143d4ad4f75ae5e72118b80282683b482c0