Malicious PDF — malware analysis report

Static analysis result for SHA-256 6795a24d7da7572e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 652fadce634a0871b3e7decc42f7a3b7 SHA-1: 135761b0d1ac5847e2159b4d48558b52504325ff SHA-256: 6795a24d7da7572e959adb926c3146883c237b435d2dce8911012aa78c2a53dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=basket+and+ball+apk
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fulutu.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43372275855.pdf
    • http://augustaelectricalwork.com/editorData/file/81917057047.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382fc61c576---8574616052.pdf
    • http://bdnchem.com/upload/files/36226439611.pdf
    • http://pampa.be/uploads/userfiles/files/26220508179.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161467c1f7794a---valomomesutavem.pdf
    • http://lamorenj.com/userfiles/files/37120357071.pdf
    • http://boldogelet.hu/media/56470166013.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/gakazesekezabawiwibozak.pdf
    • http://186086.com/upload/files/napobitoletumumu.pdf
    • https://mehfermobilsaglik.com/userfiles/file/6080693209.pdf
    • https://ans5680.preneed91.com/upload/files/74603749367.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/529cc265b56ece17bf668741db5d7816/90085627333.pdf
    • http://maryalo.com/userData/board/file/lokekiluvowuzuxagenegam.pdf
    • http://tribo.kz/userfiles/File/76290952399.pdf
    • http://kstarsmall.net/userfiles/file///94782236829.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/98106958127.pdf
    • http://montex.pro/uploads/userfiles/file/xuruvixafe.pdf
    • https://bayihoki99.com/contents/files/832513233.pdf
    • http://brianhaymore.com/images/e/file/masipitutevujerumuv.pdf
    • http://duplisite.com/userfiles/file/nuzugevizafidamo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d428.bin
545d8f1d5f37d59f2cd8f272c44b6b5a5d9fcd9580b504275aef86dd1dda6700
pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 16948 bytes
font_01_sfnt_off0001007f.bin
024a56659c97bce16ba1a0c09c87dcbb813909402fb1036ee5388d481a37119d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 10356 bytes
font_02_sfnt_off000117d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 16792 bytes