PDF malware analysis — malicious · a89dcb4191fd8bca

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 06:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 34f0a977278a854863d3e465986cd400 SHA-1: 49f9b9ab4a6300b00e066734088b38fc95e6ba33 SHA-256: a89dcb4191fd8bcaec84204c563c28391a21e5bb5075946662c1fbadd54394c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The file's structure and the presence of external links indicate it is likely used as a lure for phishing or to distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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=bretton+woods+conference+1944+pdf PDF link annotation
- http://nanoscopy.ru/uploads/files/68830337850.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/de14c6ab9952ace05f3a74e6e5c5bf8a/88862580832.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/25400260736.pdfIn PDF document text
- http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/goxogosi.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bf2d2ad70f16cc37b525d9da064d0bb3/46013489318.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9530b973f---tovisimutolageni.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/kipopenudusemivitumurus.pdfIn PDF document text
- http://uamarkets.com/images/file/wilutiduf.pdfIn PDF document text
- https://thefertilizerequipment.com/d/files/rabuteku.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/sisunebenaganawafeje.pdfIn PDF document text
- http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/42872163830.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c755144b3f---94037263361.pdfIn PDF document text
- http://ebslang.net/_UploadFile/Images/file/datubunaxapizoligurokozoj.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33cf02fae4---xuzanikopigimowavufeze.pdfIn PDF document text
- https://powermailer.in/userfiles/file/temepezuzokoragufo.pdfIn PDF document text
- https://cincia.ro/ckfinder/userfiles/files/12141934068.pdfIn PDF document text
- http://rivebistro.net/ckfinder/userfiles/files/93999265521.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/ruzalevubevib.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/72ce62c16109b2345b9f722a624ca686.pdfIn PDF document text
- https://cavalier-hundezucht.ch/userfiles/file/78830597217.pdfIn PDF document text
- http://greatnice.club/updatefiles/file/purusiwamafogubu.pdfIn PDF document text
- http://sicilyontable.it/userfiles/files/mobuwobejexojixezinew.pdfIn PDF document text
- http://veterinariomauracotti.it/userfiles/files/vasobifetuvawuwonaxo.pdfIn PDF document text
- http://hangquangauto.com/files/movikaripudopivuk.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_off0000bf3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF3C	16200 bytes
SHA-256: `13478a6ebd2b365077ca78dede433d1f36d0d6aca17f8e54ff84e915998305f0`
`font_01_sfnt_off0000e8fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010111.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10111	10748 bytes
SHA-256: `ace904ce1416b3016f2f5121436d1adecb85e200af4a0acb0577ccdb7a18e86c`

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