Malicious PDF — malware analysis report

Static analysis result for SHA-256 080411d8e7b100f3…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa809ddfcf6b9477d03e4edefc97d91c SHA-1: 62dc5acd738520b18e09d00559d7ab53e77de706 SHA-256: 080411d8e7b100f361a32d100c975d1b72d9bd549564fe83c9fa6e088dab198b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, directing users to numerous compromised websites that host further malicious PDF files. The presence of multiple links to compromised WordPress upload directories and disposable hosting suggests a coordinated effort to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tqf7eq2i0hero8lkf6fdt3i025/87067256821.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608982f59b92a---gerafepanezebegim.pdf
    • http://hzjksj.com/images/upload/File/gibejurunefamofilosek.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073215e9fa67---46547649720.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5ef282c809c2007b651dd69a94a4564f/44743699412.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/oh4hcl9dlhs05kabhb143bp2t4/luvalapekitavojituwofu.pdf
    • http://amadpich.com/userfiles/file/99965702241.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc356c748---63439825610.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6c7163af---kimogise.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079648656a6e---lilowisetinejo.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/16515917150.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/262e062075717a8ecac674046c528b3a/27673742437.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/konab.pdf
    • http://yjsyrj.com/userfiles/file/dopadataxogedazoximax.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6a165a8ab0e76c3e51ef517621010b5/nibixifixadaliwadiwani.pdf
    • http://acecaalcoy.com/userfiles/file/76214109060.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acea5a0d176---filefivumutulasubudalo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988647d66df---waximapifovozoru.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce50ee6f9---86705392020.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/91139019532.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608121a85de4f---79561716775.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roll+me+up
    • 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_off0000ce3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 16792 bytes
font_01_sfnt_off0000e653.bin
182e2c212244996fe4f95d0a63433aeeb9c57d4da46d0d4ce222590bc309141d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 9832 bytes
font_02_sfnt_off0000fbe6.bin
c0094871c0c6c6cb68b5a7f898e99a54db7f45401a28b7b07e9391ec0f2e7bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16740 bytes