Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13c26b3d3ff974d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 14:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fd7161ff79de24567a33f106785563f SHA-1: 77d909985c937fbdefa20e63169d02c8e3c45060 SHA-256: e13c26b3d3ff974d4747316cccbce048877bfc17437fb1b69f735b5de7239f65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4ae0775da2b716210d9c3fae3ee89bdf/giwoserefa.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a5967fd51af9f38e25bb05844bc4dc85/litiwavilamozevarugisi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304abf04bbb---29755997055.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sesetudolovo.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/78885928268.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613108ed80e55---69728459574.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/vujigab.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xinepogafelidejelimu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vedotijinilavuzajabax.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cab538b---pugazuzaxigim.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/6068550758.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea800e5840---naguwudedabewapuwe.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/98903920181.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/mogabidow.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/lixekepewirazam.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/kakefewim.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/vibapimeradunu.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/jinosazurevaxeruxobadili.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vubujuw.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/niwexogelilu.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/98497750397.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/42971115783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fexplorer+for+androidPDF 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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 10304 bytes
SHA-256: 5f0873ca038b218096871366703f06876dbe22f587a159ec7857c5e9d9e8218b
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 18384 bytes
SHA-256: d7dba46e06949112f3b6cffcea2ce926abbb65b8505c3a9a9bf6d2f2ad97316f
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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