Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4711a2b8ca77c3…

MALICIOUS

PDF

142.6 KB Created: 2021-06-25 17:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d93c71e584a4f5072f6579c50ae87dd3 SHA-1: 205a886f7a4fe1f3c9403c9e3afa2d38174e52db SHA-256: 1a4711a2b8ca77c3c4e1ea4c446e31f26167b2bae865476a0f3c6a217c81b137
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to files hosted on compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://gptools.net/userfiles/file/samuwamixuxijasisa.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c19e3ffa8---wapur.pdfIn PDF document text
    • http://biosite.ru/images/news/file/bivegerafenobemi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/83611233696.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160840f78d6a14---83072395714.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160776e45c565e---44343874468.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ab2739b---62641657591.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dc9a8b11---lofibavegedaje.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d545f5e65afd84c50a18d303db431403/vudokutemum.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/3509338112.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/24b2a30c13b67fa0c00af76f65e03823/duretagakaberagak.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f915c76f0f8b9ed2c44559dc7cf1c5d1/fokan.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5a67c3ce40641a5dd4401c9eb4be1afe/92949588097.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kakoliforamamofaba.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/42446430233.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/09652a5rkr6ldj02j4t1g87t6c/powowuvivufisivurusejesa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgm8qa0r2gchf4i4q3ugl3th4v/89107794431.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2dbafe7f8940427a94e5e574ad529dd3/bufudenowam.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/bejowituvelamonukob.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb8d507b9---xurirogavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=snow+white+with+the+red+hair+season+1+episode+3+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643B 37200 bytes
SHA-256: f00b9af3a90be49f75bbb17b746ada59197c8136a293b0af8dae63ec9f90276e
font_01_sfnt_off0001cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC0C 18148 bytes
SHA-256: 161d128e02e098d9dafadf1a9398ebcc3df335df5e9d894f3aa733b61f81cf39
font_02_sfnt_off0001fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA5C 11252 bytes
SHA-256: 0c609bf1a80edadb723b27bba0ad87167902986b250a7caaf3c625232d6f6971
font_03_sfnt_off0002145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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