PDF malware analysis — malicious · c5ae90284b3e0c72

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 09:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 86136be58559e3112fc0362152eb8320 SHA-1: 598246270796d88a1fee16c70f67fbdab5bf3c57 SHA-256: c5ae90284b3e0c72238815f71706da50511bb13c3c63547ecfecc47cfb9fbb3a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.area-tlc.com/public/ckfinder/userfiles/files/zisabakijutovinaguzukuk.pdf In PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/848f9gfua00dsrpij4qctvpt71/7354021247.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/81187057571.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mrijdkrc5c545c0sfkugo3c23c/sapobasuzojatamupegogep.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k07hnauavk8j9qq9b227vjj2jn/7529308636.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0009d0303---lumev.pdfIn PDF document text
- https://stotex.rs/files/10134819456.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/sinebasubegifuzudebeko.pdfIn PDF document text
- https://lesura.net/userfiles/file/60669512661.pdfIn PDF document text
- https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/toluratesu.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0ce0232c75d4d685a9a237c1ff0cad8d/gumow.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaba2aa317---19392010468.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab59b66a4---sibosatisejazekizorofuvut.pdfIn PDF document text
- https://nazragame.com/calisma2/files/uploads/putazotokeme.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d1a64adfcc2dce07a7bdbcff5fda91c2/pazezemigetiwujaboveta.pdfIn PDF document text
- http://aviteksural.ru/admin/ckfinder/userfiles/files/zasojudumojopifatug.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba9b57174---44432562222.pdfIn PDF document text
- http://yuc-fac.com/uploadfiles/20210801233854.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8702f27822eb3bfcebe5307a689cb8cd/79860458415.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/afed44cc89adb83a6ff8f164eb64f025/6426120626.pdfIn PDF document text
- http://women-for-marriage.com/ckfinder/userfiles/files/75778555067.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/535541b946001575351183e5a1374fe8/nufak.pdfIn PDF document text
- https://kientrucqhouse.com/uploads/image/files/55798941082.pdfIn PDF document text
- https://www.asoriofrio.org/ckfinder/userfiles/files/bulufoxeta.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=class+5+math+book+pdf+2019PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000b97d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB97D	16668 bytes
SHA-256: `6c00ceac780d3f422ddef1c614ceb0fce5064fd832f35bc1808fe21ba17941ab`
`font_01_sfnt_off0000d0cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0CF	11196 bytes
SHA-256: `3812caf548e55f25b1e7697766acbb034eb1932a79e00cde658cb355ef07b0c4`
`font_02_sfnt_off0000eae9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAE9	19292 bytes
SHA-256: `a403a6b6905a00d3220ce0b26af7fef8623e88774422c1bdbc6f68ab9f9b1707`
`font_03_sfnt_off00011c4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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