PDF malware analysis — malicious · ed4fb9666dc6c147

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 05:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 6f74ac5f522f1a1b4adb2d70afb6d6d3 SHA-1: 6461f71c82d6f6a280112adab64d4ef3e65d792d SHA-256: ed4fb9666dc6c147b9b826dbda44e1b0ae036ba482ca636ad7838c3231933372

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://huntic.ru/uplcv?utm_term=example+of+proverbs+tagalog PDF link annotation
- http://klaaswester.nl/img/file/52103497500.pdfIn PDF document text
- http://www.haztartasigepszakuzlet.hu/pics/file/91796153761.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2e5a9d0ea9ebc22ffa37601ee281279b/bukataforonekoxaw.pdfIn PDF document text
- https://appvid.eus/userfiles/files/puzipozumozamusujexise.pdfIn PDF document text
- https://www.creativetalentnetwork.com/ckfinder/userfiles/files/22392504892.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/86686948134.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/65447234763.pdfIn PDF document text
- http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tovekejunafejuzubotuw.pdfIn PDF document text
- http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_12_50_24_7808.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6c87a321---vimebixamafuveba.pdfIn PDF document text
- http://nanouklid.cz/upload/file/58617836778.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/96992976424.pdfIn PDF document text
- https://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdfIn PDF document text
- https://strongpointmarketing.net/userfiles/file/98410833698.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0636e7fdd---wawomupusofijinelitolezi.pdfIn PDF document text
- https://skatrip.com/basefile/skatripcom/files/kikasev.pdfIn PDF document text
- http://dtyxbpzx.com/filespath/files/20210903131107.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/10747855623.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/bugalatuxinudivazinetu.pdfIn PDF document text
- http://op-gold.com/ck_image/files/58635433212.pdfIn PDF document text
- http://gamebonda.com/ckupload/files/7878119503.pdfIn PDF document text
- https://dd-inside.de/userfile/file/41591521296.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/33338862899.pdfIn PDF document text
- http://nusratali.com/userfiles/files/76414610982.pdfIn PDF document text
- http://winkeleninzundert.nl/uploadimages/files/4541502290.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/xufilanu.pdfIn PDF document text
- http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/2656079529.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_off0000b5db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5DB	10796 bytes
SHA-256: `84c4eaa03b0b186fe071aee40c69ed7a1c3798a00055af85df81ca1853c7e35f`
`font_01_sfnt_off0000ce9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE9A	14968 bytes
SHA-256: `eb22215beeb6ef90f8d302493dc78ee9af9fcaf9cc9dbb89e1edf50408f35a4f`
`font_02_sfnt_off0000f412.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF412	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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