PDF malware analysis — malicious · 854b371802db3c43

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 04:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b95776ded5295ac35ef3c9edef81797c SHA-1: 7924fb6229e1a4ed36b5eb9828feeca8ab8a9db1 SHA-256: 854b371802db3c431664d50c1227abf291cfb6544fc9a98e18085073677209cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=refuerzo+y+ampliacion+matematicas+6+primaria+santillana+pdf+saber+hacer PDF link annotation
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42c050ed1d---137651661.pdfIn PDF document text
- http://quadocdao.vn/uploads/files/43764332883.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966fb9c1fb4---98270101229.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/mirasumobenezipi.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb39c8b4dd---42827812081.pdfIn PDF document text
- http://hodinovysoused.cz/upload/file/67148412800.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/kunewazazib.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ffa15b79d---52117953981.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f6ff17863186d5510f535b2557bf088e/72002617667.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c688d8b542523135522d4c2b46d78c97/lufipujetigezuxujonireta.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5478e9b42f6f7dca98006af87d110e00/40590019469.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d609e957---93001378428.pdfIn PDF document text
- http://osc-pribor.ru/products_pictures/file/debilozub.pdfIn PDF document text
- http://alpha-cp.com/userfiles/file/74729142096.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eabb9e30a---23477210448.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad750b7ac90---26008483448.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7de4972e9b9f2adbaf7b01d6da99f22c/85653702532.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed5279bf6---gabenotaxivifis.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/27811143807.pdfIn PDF document text
- http://fincasotilloviejo.es/files/sotillo/_repo/file/simogo.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/duf12nmlernimovdq9bp5l1o9m/sepefekaropujazavoni.pdfIn PDF document text
- http://altadirezione-consulting.it/userfiles/files/43773404181.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sl3kqel6oooiv39aucubttmgii/zidunizulonixanaxevizeg.pdfIn PDF document text
- https://chameleoncoupons.com/adgprocessing/uploads/files/17649841537.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b564fa394b6---tepibukisakubodo.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_off0000d0ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0AD	17932 bytes
SHA-256: `4e17554318933c9bfb2b7c7369f3f113a2ce167133986ccb47eab3c1c91d9c47`
`font_01_sfnt_off0000fde6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000115fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115FD	11512 bytes
SHA-256: `a1788deb92f2ecc52da40124e9ca5828b24f6908411d6f5913ce49b12654cb0c`

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