Malicious PDF — malware analysis report

Static analysis result for SHA-256 935b42aa27f08c3e…

MALICIOUS

PDF

85.9 KB Created: 2021-06-21 18:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5e4573e088ffee9e2a013f80a04377f SHA-1: 096b2a0678f19840361b33fef5ddb291315319f2 SHA-256: 935b42aa27f08c3e10b406c1edeed4aec5c32ce9c0a69a1e02a04f5db719a6d7
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 0.9994

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4deebcae52---xudupijot.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ctp21rgsl868g2p4g5gg7dnct0/68845434552.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1sgcvk62bpsm0psuae71tlhod4/76837869093.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jjoe7q6h0k07ivsda60btpeh4b/mikezibesasuxiwekexukefiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcaba2e60---majurulavedipasezofiz.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/biredujugi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/34q2tb2s81f5i4jf5e3iv6emmu/7973811014.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964f3454773---10217088663.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c452baca631---sigegevam.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fafa00f608---60786455250.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/34636648363.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/gajejofuz.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/463560ccf3d764f4fe7d71349dc554a4/gulifiv.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/00b7833f433b43d69fed7ac3319877f0/40763802513.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/lunuwipopemapud.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/tojeralubaxekedam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=multiple+webp+to+gif+converterPDF 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://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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 2900 bytes
SHA-256: 86843db252a9b1b05fe08d6d97aaf0f047db0f48d5d16fd80b2cdcee374de1fc
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 5092 bytes
SHA-256: 8c749e4e3ebbb0bba394ebc4ad2285681225c54631e00a4d36a7f5cd7748222a
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 4256 bytes
SHA-256: 77c64f1eee0dc97acdcada3976dc8983ef9afccb10861304a3185d765e4605cf
font_03_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 11212 bytes
SHA-256: e1b606e4ec690ce330b68af323753d0386c5e8d2aee30d6cfd78db5e68ad72df
font_04_sfnt_off000133ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CA 16284 bytes
SHA-256: fd7b87c976b31bc1e6240391aeadcc193e4ef4bcffd3f3286d54a599f6200659

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