Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4591d9336f6b56…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 04:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57ca3383a315f8f4ba22493bc00b2ced SHA-1: cffc05c391b94731c6a2cbcad2eb8a71ffa00201 SHA-256: 9d4591d9336f6b560969834efaffa4659e4638a88c382e254f76a70be59fae51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3adda722---68761633017.pdf In PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/me2lj3ikn3d86qja2oa9ffhfde/80539107876.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tezomumenulifofezexaji.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a743d85065---pilavamovanopukujapivipew.pdfIn PDF document text
    • https://turbooto.vn/upload/files/vuluwa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f25bf3e4---44839930103.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4342db8dd1b18e2a91318c90d5a94263/muvonabomexefenejakize.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dce70457---95528058928.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8cec3c89c0f88401f4de93c4fd9c64a6/gudesiku.pdfIn PDF document text
    • http://teraval.cz/res/file/febawumu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tesawulew.pdfIn PDF document text
    • http://mesterek.net/tmp/17456760469.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pogozepugivunowikivizuke.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/64662691992.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wagetanojozeraxop.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/fowakipanifajozinipalik.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/72e4bb7e0b4f23dbb81e83d9ddd5962f/3077332187.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d8042f879---23327717543.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210621_91C708B4AA11DBC8.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/osjbqe29p89rf51p0e0knfmodp/35145158275.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6f6a15d60e436fa96b0d794de13677a3/68822520290.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/52678525402.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/nazexokevategivukodigavaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=parallel+and+perpendicular+lines+geometry+worksheet+pdfPDF 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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 19104 bytes
SHA-256: c0d0386473c571a82af2bf544b3e82578717e1c9973a4ae7a2cf9a025abc6278
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 11460 bytes
SHA-256: 0bd09c68efe8c0dc65dd2154370c2014aca6dd51224b462443cc5a07db863467

Open this report in the interactive analyzer, or submit your own file for analysis.