PDF malware analysis — malicious · 98413e28488539c0

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 04:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4fbb60ec686595b5ef31c83f29924193 SHA-1: 25ef543253ddfc081077e06038dd6f6a03e50a27 SHA-256: 98413e28488539c032bb4debc4755c189a1e0b30f9ab1617ac30c0e0c6c84c2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm suggests a redirection mechanism to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://infrive.ru/uplcv?utm_term=comite+de+bioetica+hospitalaria+pdf PDF link annotation
- https://heatingboiler.ca/fck_upload/file/wisegiv.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2f3ea62a2ccd8325c1239e06502ae2b1/7206371806.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/91168893630.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117e98e28e5c---45851499286.pdfIn PDF document text
- http://abwpetersburg.com/uploads/files/7191812630.pdfIn PDF document text
- https://3eyamaichi.com/upload/ckfinder_temp/files/20210730105909.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/kekuluj.pdfIn PDF document text
- http://wittlich-luexem.de/userfiles/file/kinalugudal.pdfIn PDF document text
- http://sicilalluminio.it/userfiles/files/97910312270.pdfIn PDF document text
- https://agros.net/uploads/file/1721377315.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/niwadurimi.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/29645bdd3809910251a3c8eca525fa70/vowuxonovidexemafazotijan.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32418995d3---lelaxeras.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883b151c944---vunanobisozojijuj.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/10e3040ee8db8cbd409d23d4c2833184/21819788071.pdfIn PDF document text
- http://vdi.vn/userfiles/file/23804121855.pdfIn PDF document text
- http://hkt-optics.com/hkt/images/userfiles/file/7715719582.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d1993d861410a07db6667f896eddb353/zobegijutukapexi.pdfIn PDF document text
- http://sevoir.hu/uploads/file/92937907287.pdfIn PDF document text
- https://lanna-flyingclub.com/ckfinder/userfiles/files/85617124543.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608305eb3f085---tuxanekarafekemewafewajub.pdfIn PDF document text
- http://ez-surveying.com/htdocs/cljr/data/files/61937471260.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/008a7e65fc28918aafd4921740ceaf83/27287290331.pdfIn PDF document text
- http://risorsaterra.it/userfiles/files/wabolevawivoxavikasugux.pdfIn PDF document text
- http://aitrans.cn/UploadFile/file/F1202108041413001981.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/uafq0k4kcmutb38i8rqi367nob/24585159876.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_off0000b8ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8CE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d0e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0E0	17348 bytes
SHA-256: `6f196ee375062a8a6cf375758f3dff10507a2c1a83f9f57ebe924f7a96c6c7ea`
`font_02_sfnt_off0000fc7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC7D	10952 bytes
SHA-256: `145f0f59f3f16e2ccb1d3153ee92138add37321b307f1a572b62a25db5bd0c7b`

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