Malicious PDF — malware analysis report

Static analysis result for SHA-256 454249a1d5ed1cd4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 06:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8355c763294443b7a1f97e0729f27548 SHA-1: 430fa1595088cce41a77e38ec6563bd40cfb5d51 SHA-256: 454249a1d5ed1cd4ce4ee4f9a3845f53aa3dc88ae910533ea09a8a2bfd88b52c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to lure victims. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=possessive+noun+worksheet+grade+1 PDF link annotation
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/32573996650.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lkhn1alcshusjpod2biertcl44/15123504229.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/92165347546.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rlos393rrohanca0tht0d7k87n/muganuworosez.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/28483915885.pdfIn PDF document text
    • https://hgb.se/filer/file/paxazaxazezumaxevi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713952ee8d9---xilojigudaji.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/5468547800.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/67383112369.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8c4735422aba239564fe0322fec5f2c8/motemoxipivo.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/fedawuruzikezubefema.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zewerazizupukuzemulujixu.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/tovenuv.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3278527e91---51124143625.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ktca7unji6kvdl7b88gvj4768f/87047062534.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609474f696643---5560919541.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lagopidaragadesegixusuvit.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/76404585935.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2b680ff5e---gikovuvozonilutuniji.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tf16t45u9lgjreaf87qfo6i413/rajanuxapiwikikelebinawoj.pdfIn PDF document text
    • http://kotolantopeni.cz/file/26674480435.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210606205019_b24g7e.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9a8ec5217a4e617fd18193f16e6056bb/20911002636.pdfIn PDF document text
    • 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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 10876 bytes
SHA-256: 245ba02c2139033238359f8a25077820767966e4cd6412476bf24f799ddc7098
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 19220 bytes
SHA-256: 85a80d1f825b26408acf180f7f39fb815dfeb75c05b7616fc239456666f4ba79
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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