Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21b03c54a0c486a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 20:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 062f38d5563690e4cbf93b3a6b989540 SHA-1: 50a9b604f25c711ffba6b81dc13ffb931db4b2d9 SHA-256: a21b03c54a0c486a4ffa4650b3f32b8346be3ed50d48b37eee356ba70b92ea19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://groupunsur3.com/contents/files/62419181393.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6114ef3d505a4da0ddc6ffda8f3602f8/wakadolofibuxifukij.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/96415952478.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vozazaxud.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/jilunurufabeludulola.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/98375009730.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55998660540.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/81760529027.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109092009135206.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f56085f9f---49591628453.pdfIn PDF document text
    • https://raljob.com/userfiles/file/tujogezikekagu.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/94795102954.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/62315181821.pdfIn PDF document text
    • http://vit-physio.de/file/mibixasebudojawutavalogab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b4c019c1f16abd7a12d979ecc3ca52a2/nepetevi.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66048602113.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ad86afdadc4fe95f13e4987c98778940/lexazigapewotidigeti.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/82303407522.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/sijatavivexevulita.pdfIn PDF document text
    • https://siroyensao.com/upload/files/35277215955.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47641d2f0---82003054202.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/16697700221.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/14864030861.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/93312508295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=words+that+start+with+j+and+end+with+ePDF 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10508 bytes
SHA-256: 4faf5ef6024ad297e5de5c7f092b90c4756ac470468d94d345f8623b6b8cb4f9
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 18216 bytes
SHA-256: 2cfeba3221e2a2bb2367c6e87ec04345593095fab43675264e0a7c3fdd733d43
font_02_sfnt_off000134b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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