Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4461f11bfade75…

MALICIOUS

PDF

109.6 KB Created: 2021-07-30 07:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a43b955c24b235e0bacf6cc7a569576 SHA-1: 20bf87a0e46aa6055f146f0d7a97d3297e951945 SHA-256: eb4461f11bfade752522237c39505f6b65e85a16582cd7e2ea1477a568c70f3c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to potentially harmful external sites.

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://cructi.ru/uplcv?utm_term=lil+uzi+vert+all+songs+mp3+download PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bec68c06e---6258145802.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947161e70b2---57811545831.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca48ae0e2---52114266978.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dcf995744b00837662c083ce619e5137/72684211008.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06fbd183ac---diguwabalofativugapasifix.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/vijode.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/42487593951.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/70336490314.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/17ec50b17f2a35af348775c3df004bcd/nudalalavajizub.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5eb9d353e---65504200567.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vitititesinot.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hr0t66cmpqqgav41kd2q803vsv/90643319010.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/gijezeju.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pfbhof3n364oamslnrtsufuddo/48473029890.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/naxipamubujumiju.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gezetomubojagusom.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/30266315062.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/68974070839.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc1895c2b---fuzotajovevo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ketedapu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 18076 bytes
SHA-256: b2e9aa186562ed6e7890fa9ecb613c37f958c052b930f69ee018defb534e17ab
font_01_sfnt_off00015dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEE 17036 bytes
SHA-256: a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
font_02_sfnt_off000176c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C6 11176 bytes
SHA-256: 4980f17f6a4459f02045e8b62b53b14376ff45e969c2b48cb5613fe2ae954934
font_03_sfnt_off000190c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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