Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdd5775d09d9b53…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 11:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eef81ce6741793d0d386273c0a9b4593 SHA-1: aea6846e30925eb8bf80a1f3a39b70e301e870d6 SHA-256: 9fdd5775d09d9b53ec389fc3712d73bc764dae545699bf81dfdff345fd6dafa9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/780b98ccb7cd158125f93dedfb333756/56544312655.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700e9590c7---vatufitovin.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/14475765247.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/13j1u1vrosg7upl68kb5kgr9lv/fufapebaguzazeg.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/lenaxefuseradiwure.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aadee958b---58477788579.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/068b1860d39340edf9f0f1ffc5a6526b/60260208336.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160847cf5767d5---nepatepalogifarememazoxu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/kbltl5e2l9gudumt64f96cg26v/pulepiwix.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/h9ur25vgr943pc3cks5p61o02u/vozigodazawilan.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/51466426207.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pasobotikuxubat.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770a69768ae---poputofuzotiro.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/425c23639d80f41a1d4f89c4dd55de38/fekupi.pdfIn PDF document text
    • http://zerosquareonline.com/file/61629824526.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zajarevitomove.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac958e889d0---bifemawijomemowal.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/be30abf209c04d1116cb9ec3e78cc19b/11724794158.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/39114632627.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe3c4da91---37032858495.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1bb6870d7---42746254195.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090f81eda7c6---zulilutaxiwifek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=consider+meaning+in+kannadaPDF 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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10572 bytes
SHA-256: 8853ffe5108deaab869efa1a0da2a60f1241b948843af1395acbfd2203716f6f
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 16948 bytes
SHA-256: af5c3df15a1217a6e55275073c050432eec2054d3376e37f46dc2d99b5840b6e

Open this report in the interactive analyzer, or submit your own file for analysis.