PDF malware analysis — malicious · 9d86aedf10b30a35

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 03:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e18374fd08b5370879f379f2b9a43c8f SHA-1: 7e6d788a761fe0aa4f1dad2d672dffd2e0dcde2d SHA-256: 9d86aedf10b30a3574406ef6293edd0e57e53e5dfa3ebf3bde2714dd1b462d4a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm suggests an attempt to obscure the ultimate destination and evade detection.

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 http://newgrids.com/userfiles/file/97103853629.pdf In PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a22536dab44cb2b5fb8a97769361fda6/munivobivesavadow.pdfIn PDF document text
- http://aptekarynek.pl/zdjecia/fck/file/33667387565.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614444182e57b---77700768700.pdfIn PDF document text
- https://bio86.net/userfiles/fichiers/niviputowebuxo.pdfIn PDF document text
- https://pinyardim.com/calisma2/files/uploads/5576417117.pdfIn PDF document text
- https://viettincapital.vn/upload/files/4041482026.pdfIn PDF document text
- https://sunriseinnjasper.com/nbloom/fckuploads/file/9719488709.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2969d517839ccff3fb43c96a44ea551c/32355313376.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dln26nm670ml2p442g5dei18mv/badejit.pdfIn PDF document text
- http://maekalocal.com/Maeka/UserFiles/File/44776825768.pdfIn PDF document text
- https://bancodevida.com/bancodevida/admin/images/image/file/43794377354.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j1hspavqnfforvtn1th052lkqb/renetidopasitudemuto.pdfIn PDF document text
- http://dkmmotor.com/files/userfiles/file/24952114007.pdfIn PDF document text
- https://srilangkapools.com/contents/files/66491155947.pdfIn PDF document text
- http://3e-recycling.ru/app/webroot/filesfiles/zalaworutikuvigenuma.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/lepizelakunabopusonifepo.pdfIn PDF document text
- http://issaproject.com/app/views/panel/ckfinder/userfiles/files/58042133182.pdfIn PDF document text
- https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/lilekerafedenituvuronajo.pdfIn PDF document text
- https://pensionradvanice.cz/res/file/mafovedulativivake.pdfIn PDF document text
- http://chinawin-consult.com/userfiles/jafukidomiduzo.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/57d26d438ee6a02a3de8ad34bb79027d/55725400448.pdfIn PDF document text
- https://thisissati.com/userfiles/files/zetago.pdfIn PDF document text
- http://louisamerino.com/userfiles/file/75729474213.pdfIn PDF document text
- http://ozdermusavirlik.net/userfiles/file/3954676900.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=amlogic+s905w+romPDF 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_off0000de0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE0F	10568 bytes
SHA-256: `17040e5f1f60ce726b109eda9d11ca341e3e03ff8d2f3dd463e4db6a6d8257c0`
`font_01_sfnt_off0000f638.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF638	17880 bytes
SHA-256: `c282bfbb66ad7f9c674e778b5bb3a91ff0c4053c8f38e27172305036f922c6c3`
`font_02_sfnt_off00012408.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12408	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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