PDF malware analysis — malicious · add8cdf66910a9d0

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 02:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 14bd8145a7d07ae7b1e1ce2e71f8190c SHA-1: e05167bde51675665fa8bc39191931b1f8ddf814 SHA-256: add8cdf66910a9d0b0978aaf65462858ed9576796a70cfa0c220c38fcfead8f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware delivery attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=50+ml+equals+how+many+oz PDF link annotation
- https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9b9b6e2705e6ccdb0ac4e38c306e285a/mogabifizogifopelesi.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/sixom.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ec688789707e85b584aad0786fdc755d/wusuworazopup.pdfIn PDF document text
- https://eurocomm-italia.com/file/fewinas.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd34ca69d28---4686899796.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e9bc1759745afccda3d81173e12c6c55/9944808855.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5661f1276---vokatudavimuporoka.pdfIn PDF document text
- http://bacsiha.com/public/ckfinder/userfiles/files/dewajimufoduxidafago.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/fibokofisa.pdfIn PDF document text
- http://globomax.eu/userfiles/file/5703023567.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/22pe5qm2ktfp9u5ji4g5kul7r1/89223771049.pdfIn PDF document text
- http://trungtamdaykem.vn/Images_upload/files/23232739241.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0cf2c46f8582f4f5b5bfdbc4889b25dd/bafalodu.pdfIn PDF document text
- https://gangnampools.com/contents//files/kakananuvewesonajodu.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qn6lr5i7jkkp29ktjddd4lkf7q/79339049816.pdfIn PDF document text
- http://cesmclassof68cheyennewy.com/clients/82478/File/rorijovosokimuvimupito.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/18900063758.pdfIn PDF document text
- https://wojczak.pl/userfiles/file/lewidedirixogapewu.pdfIn PDF document text
- http://22743333.com/userfiles/files/41021413017.pdfIn PDF document text
- http://ranaghatpchsschool.org/userfiles/file/74196137195.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gijexasurozu.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/jexagezunufurorired.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610544f0da657---44374474706.pdfIn PDF document text
- http://asiavent.com/UserFiles/file///58922107382.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_off0000c66a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC66A	19480 bytes
SHA-256: `508b068af8d58fc6c228d49ba2a8b41277245097a7371c06b54e4f4e99814f60`
`font_01_sfnt_off0000f983.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF983	10748 bytes
SHA-256: `012834fc5edec98854fe0a6373ee528f6ec6b10e37ad78bce08a708b5cc9e7e8`
`font_02_sfnt_off00011232.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11232	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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