PDF malware analysis — malicious · 350d688223e476ad

MALICIOUS

PDF

77.3 KB Created: 2021-08-19 19:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 14e9a71e49ed3f0aaa99a2fb9b12ddf0 SHA-1: 724e071feb37050627757c631421dd90b2ea3bdc SHA-256: 350d688223e476adfed6205e303cad482a5c9f1720d0672d7a674d8350774a58

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc421d23b---75544559824.pdf In PDF document text
- http://katachizu.com/img/news/files/kenefuzikim.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/zupumuxugakojotogatutuka.pdfIn PDF document text
- http://dyglas.com/userData/board/file/65325660422.pdfIn PDF document text
- http://garage-fuji.jp/js/upload/files/74182714713.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d65c82e3---mevuxafikorufufek.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed6910fb7---xaluvuzu.pdfIn PDF document text
- http://fsanaq.com/upload/file/210808134846125001nctv99e35bdl.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ffd2ba0d---kolewamuvazin.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f6899940766e74e455832eb1c8bb7494/53712113489.pdfIn PDF document text
- http://vasvaripalmuzeum.hu/upload/file/48184436943.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2bomae4a9piscsb72de8gu0ei5/dutudorubum.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/9088974389.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608651dcab9a5---25065466252.pdfIn PDF document text
- http://3q1p.com/upload/file/210806115131951252lsza99ce7u1l.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210818081630749.pdfIn PDF document text
- http://mcutech.net/upload/2021/08/file/16293735311951206006.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6ed27ec1c120ec0697aa29c0ad43758c/4375513459.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160908babf1a53---86415152840.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8291c6038f---78173373131.pdfIn PDF document text
- http://nct-vn.com/userfiles/file/fisopibabitobabapigitik.pdfIn PDF document text
- https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6fe4c54d3b437e6b3d0e3b2908e8652c/dufoz.pdfIn PDF document text
- http://libertyquad72.fr/userfiles/file/jarokosugijagulo.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bf7ee1c3e---puvewerutigugapu.pdfIn PDF document text
- http://dalnoboy.org/data/filestorage/upload/files/rezeligubikedugevosorix.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c9mrmvpv8oconc4mmnpffo45h4/lofizusaripotud.pdfIn PDF document text
- https://travelstore.tn/userfiles/file/6575178104.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bascule+jk+exercice+corrig%C3%A9+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c74c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC74C	17264 bytes
SHA-256: `ed22f0958e9b5ac3fa05951efced06a099b7b8ca8956f2940f8b0f9b7c1bf47e`
`font_01_sfnt_off0000f2d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010aec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AEC	11224 bytes
SHA-256: `50c849ba029cac6a8298cfa5808b3f8c3b185ba3f5834d2007ef035c10bf6077`

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