PDF malware analysis — malicious · 7b4652a316700916

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 06:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 452e4abc29c8e993673a7bb56c20dca3 SHA-1: f1fed837c810457b0195da7e79919ddf2b01bed4 SHA-256: 7b4652a316700916e9b1b18b0ba9b9f24c54cb92991b653124f53217b1bd8225

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The PDF also contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded script.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7v7hts68p27k4k8s41if0bg1ja/35247203224.pdf In PDF document text
- http://barcelonasixtytwo.com/userfiles/file/5834855495.pdfIn PDF document text
- https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ufkg0q0a84mfpnfveq07fnkpf0/molatazabitine.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9a6d02fa519a9200e2bc81a0645807e0/85806152907.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612bccc384bf8---83944562023.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/kuwodazomilemojowewofarav.pdfIn PDF document text
- http://lapempi.nl/ckfinder/userfiles/files/12652765764.pdfIn PDF document text
- https://olterus.net/contents//files/sejovoxosowavonipelebodal.pdfIn PDF document text
- http://rocincorporated.com/domain.com/images/dynamic_pages/file/3794260681.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/viijsjupld2pcdotm9c9n0kles/64688925456.pdfIn PDF document text
- http://skiflogistics.ru/userfiles/file/suladenojorewobij.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fe09fdb4777dbea6abdf2843e403be0b/wavofizotatoduxig.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/e4bq26kd3lphhc008b458g71d9/20820739391.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608726c2a363d---botifupafixebumizaj.pdfIn PDF document text
- http://bethanybaptistcolumbus.org/clients/75549/File/31509570863.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889971612d7---xebexibosibigekujavuv.pdfIn PDF document text
- https://upbfassadenbau.com/upload/file/73317807038.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97c098516---25353563970.pdfIn PDF document text
- https://noventa.cz/media/files/file/39695601423.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/9444329241.pdfIn PDF document text
- http://taketty.xyz/js/ckfinder/userfiles/files/gofonumofobirawexukekinin.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6878406672---10405257264.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a01d5da7---dejagula.pdfIn PDF document text
- http://186086.com/upload/files/weluxiziziloxuvusa.pdfIn PDF document text
- http://betaempire.com/uploads/userfiles/file/file/30437202673.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+pc+cleaner+for+windows+10PDF 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_off0000f502.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF502	18136 bytes
SHA-256: `0903472f3ffbd8379a434ce6cf0b86cfc538702f084152739367763d563b002f`
`font_01_sfnt_off00012366.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12366	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013b7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B7D	10924 bytes
SHA-256: `8df0a7ac5972842075c1a7422edb6900a0fb8d2fd82b2fd0e431a058bef638cd`

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