Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ec141f978d1ff0…

MALICIOUS

PDF

78.7 KB Created: 2021-07-05 08:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c45857c2f3aedb8b7e0411ab470920a8 SHA-1: 8291be41525e674d2d062153aa8a5eb453de6e8e SHA-256: 39ec141f978d1ff09d7baa2caf54f8a14bea2bafaed832457e43171cd8461223
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised or disposable domains. The embedded URLs, such as http://etre-belle.su/images/file/dakadozimo.pdf, are likely intended to redirect users to malicious sites for phishing or further malware delivery. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://etre-belle.su/images/file/dakadozimo.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e87bce6---58233939711.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/65027773369.pdfIn PDF document text
    • http://german-ex.com/42421215612.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zozidi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ea27abd0d---52648899073.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/laxirupikataki.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/pewipagunesipukinos.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/25131718974.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4334d4f4a---32083995627.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/vivigedemogifukekodifu.pdfIn PDF document text
    • http://technocom.pl/editor/file/84337163590.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6969fa63---pabubedobadelufukuxafupu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36acae5803---71622548360.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/32al5avr9brfmvmiaao3f7iguj/naretukerekuxiduretofo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22ef3f7e0192a254e4221345dd8459fa/80492594425.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dbe818e5a---97663875616.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/83949612259.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a5d0045b80b74ac42432803c726f46/55332024700.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aa0c1872763acebf60ef4cc18339d295/74538008362.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mesope.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/81675176678.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30162aaf37---51290702787.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210611131118434579.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3bba3502dd66d54f628ad256cfb4091/nazore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+find+area+under+graphPDF 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_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 16916 bytes
SHA-256: a19295631bec51094032c8e94997aa31f4731751eb4877437914536b00f29bfc
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 10740 bytes
SHA-256: 8e4942830fd018aff6bb19bd854c4f5118d8f9a75efa6ee0355f5b9729fd57b1
font_02_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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