PDF malware analysis — malicious · 1f8aa83ec3847cf5

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 02:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f974b3d01adaa9932f34a70b0c3b6e23 SHA-1: 80e11c6aec8861f3757ef0c4055583798d1d28a9 SHA-256: 1f8aa83ec3847cf59de84904bbec44e980c56b7f78cf9d81fdddba6835dfc26d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=popular+ballads+piano+pdf PDF link annotation
- https://allmassage.net/upload/file/20210513110010.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rkrsrs3kh91fp7uf9bu7ocaoo3/tabogadofogikiwijesa.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9a70aeb1a635d81d16b4d897d933024f/muripixesigovoxigapedug.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/84563915259.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5f8c65c24---21957364595.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/32071296413.pdfIn PDF document text
- http://allivecoat.com/userData/board/file/pikuresozo.pdfIn PDF document text
- https://divinenine.net/userfiles/file/63217794764.pdfIn PDF document text
- http://albatrossmrn.com/konadnew/userfiles/file/robofasukipubamivirar.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8f43682e0---sabevurit.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a64359c38502008454272caee277986/8510880606.pdfIn PDF document text
- https://network-italia.it/file/fezumawawemoze.pdfIn PDF document text
- https://siahotel.com/userfiles/files/59844044062.pdfIn PDF document text
- http://www.donboscovizag.org/images/files/65013738583.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/pulejefigigifudedusutu.pdfIn PDF document text
- http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/papirukojinobubabig.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/4713757711.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dodifaxonoj.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7ubkvhs0u0igl14iqrkjv3to4a/paguto.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771df7989f4---kizamuzuduwupir.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/koxexasimilizudexilazop.pdfIn PDF document text
- https://la-klamm.org/Files/files/8160539903.pdfIn PDF document text
- http://kerekagy.hu/UserFiles//file/gimiragipufemejutizo.pdfIn PDF document text
- http://t-p-fortune.com/userfiles/file/vuvebipuno.pdfIn PDF document text
- http://polipadel.com/userfiles/file/xegukoziz.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_off0000cfbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFBF	16216 bytes
SHA-256: `e13fdb3f6c2e5ddb5f7348480720d51a3a89b68a247555c64d80866c5f4a9122`
`font_01_sfnt_off0000f9ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AE	10500 bytes
SHA-256: `6568f36130d84de05e3a6d78f9efe74b096c91df7dc49809c1e244a96203826d`
`font_02_sfnt_off00011162.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11162	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.