PDF malware analysis — malicious · d1a53558b9dbef18

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 06:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: ea2318532f658929d2df659eb3ddedfa SHA-1: a8f53c4834534d3ee259265a48811da54db750fa SHA-256: d1a53558b9dbef18b7af154a1aa942e923a0d266895dfe9f7bc64267434e7761

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=easter+worksheets+for+students PDF link annotation
- http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/suvujefukeretozo.pdfIn PDF document text
- http://atsrealtyvietnam.com/upload/files/vuxadirifuralokuramo.pdfIn PDF document text
- https://fertilizerproductionprocess.com/d/files/98563308685.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d55bfdb82ca081a1b685ca6ebdfc7a93/90740962957.pdfIn PDF document text
- http://asesoriazabalburu.org/azaba/files/file/95945438832.pdfIn PDF document text
- https://paroles-vives.com/ckfinder/userfiles/files/14448036065.pdfIn PDF document text
- http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f02c9f48---mugemasidaserej.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/6uogkvfeonn1jomkt38bfiv0gl/bizetotuzewakavogug.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c780b6f1a3---fegevozavovexoxazizi.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/rolut.pdfIn PDF document text
- https://suadienlanhhanoi.net/upload/files/33267553112.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0f5cf209---89517657660.pdfIn PDF document text
- http://rsti.biz/files/fck/file/vufile.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/eca6ft84d0r14b0i982hailf14/39157798832.pdfIn PDF document text
- http://neoneophytou.com/ckfinder/userfiles/files/basipowokidawagesil.pdfIn PDF document text
- https://eastmanllc.net/ckfinder/userfiles/files/94386694448.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b9tiv414tt7mc46vno1kupu129/denunafelajaxog.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e1e1000945f7294192c7e6a685520ef2/wobuwedogedefijeno.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/nisovulalurojevegi.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ksbapcskummt2tvalpckqicb8t/61677058637.pdfIn PDF document text
- https://avvocatoboretti.it/file/95222416105.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ee34ef00---66577487241.pdfIn PDF document text
- http://nocleginaplus.pl/uploads/userfiles/files/8225165979.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0641d1c4d9a8d044dac9833a72821eba/jogilamunivutekenefupe.pdfIn PDF document text
- https://devcons.org/uploads/userfiles/files/somozuw.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a9bfa7d04c60dd057f2d26674971fa9a/43319033817.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bfb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFB4	10576 bytes
SHA-256: `a4a4d5c00c4116632b0e6e4964f343013f23e0de68bee813a74c56885d24499d`
`font_01_sfnt_off0000d7e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eff7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF7	17024 bytes
SHA-256: `045e393ba612fceea232d3174de88122ce021565b7dbe98973967cbd52285470`

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