Malicious PDF — malware analysis report

Static analysis result for SHA-256 511b26917cfb563f…

MALICIOUS

PDF

112.9 KB Created: 2021-06-18 06:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0b24d6959e10d1c310d91ed64d6b01ae SHA-1: 369e1bb5ecda38d28cfcba253306e28d8e23b91b SHA-256: 511b26917cfb563f00930adf287b402002b7d24c38466096340f7b48acf9417f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b7386f8aa9d61ef4d468b6e81c5c18c9/75657516020.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0187a5b99a---bagibim.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4a535f6730dfb5550892d45894f9a696/16606036380.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b760ffbc1a7aaf237150a5405f80851f/tikojajomobivominu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1586514b---metajewafakipalilixur.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9fafa07eb5b5906c361360a1a9e783d7/27748014785.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a57e82ab6---gulig.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72198a8d7---xobodobutazaz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7se93tvt58ksv6oh71st57gdi0/vimedegizaposim.pdfIn PDF document text
    • https://andana.us/files/files/sivipelesusolunumon.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b413577ad90---lunutam.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cbbc0b499d92e316692be5d313e3f6bb/vesifu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/u9ifnvufa2m34chc9of6j8undd/60372540793.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sejomurijebeborafofu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccfca95fb---ruloxuwupanexidiwatit.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/86c3a43ffb0bbbf18aacba0b7cd5a0e7/kuxusizugovujinukazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pee+mak+full+movie+eng+sub+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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 5488 bytes
SHA-256: 5b45ee9a5f06bb1836f7f285be223c9199a1d0c88d2e08e03ae3c3b656667919
font_01_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 10180 bytes
SHA-256: c583248f55f6ce09f98663d076e16f38d4eac321822787929e59a4f5a4af1188
font_02_sfnt_off000172e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E1 13672 bytes
SHA-256: 6707026bbbfa616d1dfcb46cdb2d1e5faf0a52707dbe8d1c6fdc323ca94d85b2
font_03_sfnt_off00019e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E5C 16336 bytes
SHA-256: 27a2ebaee2a04db027069d3d0970ef6e68b32f8184b3ebf80808a8df0f24a276

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