PDF malware analysis — malicious · 58ab99c750e1d6d2

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 17:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ec88d4ecd5a7487a0b487645347c2600 SHA-1: 418454d80c5ec8fed6efbcb75a94decadba9880c SHA-256: 58ab99c750e1d6d2a970dbac94dd3e97787f435ca6ebcbdc6fda55d49876c25a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious distribution or phishing lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://oniceh.ru/uplcv?utm_term=android+studio+apptheme PDF link annotation
- http://www.painters-restaurant.com/userfiles/file/15400324127.pdfIn PDF document text
- http://asr-net.ru/uploads/files/kumuvivimavamigiz.pdfIn PDF document text
- http://psychologyforeverybody.com/ckfinder/userfiles/files/11845069645.pdfIn PDF document text
- http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
- https://eownauto.com/uploadpic/files/53608279405.pdfIn PDF document text
- http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/98865708354.pdfIn PDF document text
- http://ebbers-schilderwerken.nl/uploads/files/mubug.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dd017479e4d4a6dd2e51ff55e8c6247e/xitajarugemufizomawovesow.pdfIn PDF document text
- https://chinese-wall.tw/upload/files/lufoxosax.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe073628e---14194739732.pdfIn PDF document text
- http://klm-co.ru/foto/ck/files/11507575628.pdfIn PDF document text
- http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_18_21_36_40_6505.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273fb8a978---81021248390.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/50988014853.pdfIn PDF document text
- https://rallstarawards.us/nbloom/fckuploads/file/96567221599.pdfIn PDF document text
- http://placc.info/up_image/zilanufudubov.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ab62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAB62	15264 bytes
SHA-256: `a3c9711be38d740ad2b2877e8ee2441a5d50a7524ff36f9a2786afa27beabd56`
`font_01_sfnt_off0000d269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD269	2476 bytes
SHA-256: `9e66068f7408fdcf011ef1eb05c90253355693887616f61eba9e63f900eaa60a`
`font_02_sfnt_off0000dd3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0000f555.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF555	10692 bytes
SHA-256: `02e246167de55df8ee29111eb593174d4982aac28caef8fb4ab04ada91134fdc`

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