Malicious PDF — malware analysis report

Static analysis result for SHA-256 537db5e64f8d5a99…

MALICIOUS

PDF

161.9 KB Created: 2021-06-09 10:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d66ff3dbd4c689af782d6857c606560a SHA-1: 571a02dc884a855d530569da12678bc49bdc7704 SHA-256: 537db5e64f8d5a991cbdd4290490dc655d467a1ccb57578ba2546b9972ebb186
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=screen+recorder+indian+app PDF link annotation
    • http://asupuro.com/user_data/image//file/24744222782.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vipusegid.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e56e765---11156144358.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1da5bd6836c724e982789b043124a852/48779336107.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/bopewowekesazamubina.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1314f177c51bb837f38aa3e2bc41fb19/55474353564.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/60821623587.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ecb415eb80a6611a34637704d369a232/pokigabesuvizoxudipa.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/c0s2jo69r4fc96m6q1fagdbhu7/netilivexazatipedune.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3f3db23538ac2192715fe22f70e21329/lakozijeriva.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ptnalmadb7ccebj27qssrb52u5/marifokopo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b0820ea12c54e2805ec37ba6caafbbbb/rolujaposepusowuk.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf075a8dc7---tipexumibifage.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a7a63fc35f87e1b9a53f6e773eb0639/kawiroj.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/dijisegotunofemegomipowiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20766 7176 bytes
SHA-256: 9e41781c4050e4b98d530af491608347e80e16c8f1f955d867fe7ce79477c71c
font_01_sfnt_off000219de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219DE 4960 bytes
SHA-256: 9f2fd7f0bc405edfa1d24e7cfd82deb6a02b4f4d58d7f0691b49ca024583cebf
font_02_sfnt_off00022ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AC4 4164 bytes
SHA-256: 876a24c6324f18120623a5c7a4751b0730917041a4a0e54360a42d41ae153c14
font_03_sfnt_off00023b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B35 11724 bytes
SHA-256: 16004483712f7221b682aaf63f4aca91ad62a7bcbf48d55a2200e344f5eee914
font_04_sfnt_off000262d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262D0 16500 bytes
SHA-256: 79dfe4a2a4dd1e3fbbd4d9ee579394f5d34a290505861f1156a477b5177879ae

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