Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb11d778a5190e7…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 10:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ede78d352a851504fc654c17c00e8292 SHA-1: ff9f4b2d2485586ccb6dbdcae8aaa665dd5e3cc5 SHA-256: 3fb11d778a5190e773f78cf73a5532334ba6be67aa835012548a5c766709953f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous PDFs on compromised websites, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the presence of these links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/252e6d88d32fcd7cdfb8ce851c21c780/89369359141.pdf In PDF document text
    • https://coonvalleycc.com/userfiles/file/5064615144.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5hd34k2saia3aavsnu48rq6dt0/8488949032.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/moburiwenekugolema.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/27721b380f20276051cfefd0df3f803d/71237631689.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/18245712431.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1face1854babf07590077621dd68415/48997184786.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/3454085380.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/2528830815.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/64329536934.pdfIn PDF document text
    • https://kartplast.com/resimler/files/99886321793.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c2906839---kenusutemurid.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6f9045c2---84115214819.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bivig.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7f0oelm0i7use2nr9g5lmhug0/67316680773.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/48679587291.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c49c5f650cd---guvexuzeforefelebodika.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nhlfm96te831aq5jo266jj7vgm/32900903653.pdfIn PDF document text
    • https://purefeeling8.com/data/file/dejexudaneme.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zasadiwozusanozuwe.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/57005101832.pdfIn PDF document text
    • http://www.toptehnik.si/images/56977818649.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae74c36f2d3754f00d04a2241a5ca73b/wukodiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=manual+dos+padrinhos+editavel+marsalaPDF 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_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 19752 bytes
SHA-256: 311c0734d0029e06711a12444524544d713f75746e9b2569fe03503279a93cf9
font_01_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14591 10816 bytes
SHA-256: 45ea191984a38156d086b68179c9f22a754bb1ad38b7ac0f46b7be5bab55428a