PDF malware analysis — malicious · fdba43c2f58d7904

MALICIOUS

PDF

78.9 KB Created: 2021-07-14 00:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 990de16b0ea17e58e58b0609d10da239 SHA-1: 19418c75389637561913250fbeef0f8182b57f1f SHA-256: fdba43c2f58d7904d74d83d8df283d1e0feddef0267e061da54c54888bcf3d8d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 http://bukharasuwanee.com/sites/default/files/file/58783028659.pdf In PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/321a52d0922c1052609c4b60bb5d9bca/77516388107.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5d1f417f---12002427103.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160721a21925d3---jesiz.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f6ceb399e5fc28855482ff0c02817ace/61711945436.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b3b53705---getalevezotebera.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d0d5b009f67f4b757e128323c1aa829/xelobuf.pdfIn PDF document text
- http://baaningdoi.com/file_media/file_image/file/tefuxatigadunejezaxam.pdfIn PDF document text
- http://studiotravenzolo.it/userfiles/files/5457174590.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608835fab6bbf---40344749147.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/67b7ad983d8a85cfe68ed187609082e3/66372044748.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dcee5633---palugowu.pdfIn PDF document text
- https://hondaotohaiphong.vn/upload/files/32717410013.pdfIn PDF document text
- https://salvamontbihor.ro/app/webroot/files/userfiles/files/66696564241.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cc49ld3lc2cda2n597pku3612a/18032737773.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5890713ef---69107925713.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949750ce2a7---lowiwemafelakawuzadugej.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8f5dcebe7bfa91689205266d2a8c5e89/76524093596.pdfIn PDF document text
- https://limmaginebistrot.com/file/32330788399.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb4bc6167---zapiwesagabero.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s86vcnkmhp3sgupossi7k213sh/wuxapumebur.pdfIn PDF document text
- http://sjar-tech.com/uploadfile/file///2021053118513717.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nco0i16aogtirni8kbmvhuqtv0/janifaguteketonufufina.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb3354ba2---sowufigises.pdfIn PDF document text
- http://retrievers.su/ckfinder/userfiles/files/musitugedozad.pdfIn PDF document text
- http://dominoliberec.eu/images/file/files/vasunodevujemibasaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chemical+applications+of+group+theory+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_off0000ceb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEB2	17260 bytes
SHA-256: `1017c5fc4ca5c436390d33087269bd1b1c855abd73f7b18d735b1b9bd6cb3a62`
`font_01_sfnt_off0000fbc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBC0	11312 bytes
SHA-256: `e1ca7db47732b126804557e77a19e8fc22784fe351e836c9a042a44b7b336796`
`font_02_sfnt_off00011600.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11600	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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