PDF malware analysis — malicious · 8a4f82e348fdccfb

MALICIOUS

PDF

88.4 KB Created: 2021-07-17 10:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 45d7b938e81abacae3a101450c525f16 SHA-1: 6e0ac3ecbbd8615e014aef4e4a4d46ef5b6bf8e7 SHA-256: 8a4f82e348fdccfb24ef3dd13bb1b2749c52b23daef6d23d814dc84304ba7170

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and the nature of the linked content strongly suggest it is used as an initial vector for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://egyseg.eu/ckfinder/userfiles/files/nobugas.pdf In PDF document text
- https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce17d40c7d---82815491339.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/30156189535.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/5cggdkihhoj7r6ltmofovnkbdg/5764808334.pdfIn PDF document text
- http://mizuho-co.net/file/ck/files/jopenuzujov.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609069f174d37---2828781466.pdfIn PDF document text
- https://cape-electronics.com/media/file/3366381900.pdfIn PDF document text
- https://altinhediyeler.com/calisma2/files/uploads/8432174331.pdfIn PDF document text
- http://envigest.cz/upload/file/venitepuwofalumeboresuno.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/da886c25268cfc1584ab7bf9df2968c3/60256754758.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/244fa80ad50d96d10de7429c6f1292c6/miwaguwinemilavuke.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160795c45a779c---11716318024.pdfIn PDF document text
- https://mariellatriolo.it/public/file/37988902905.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cf2584e6---88128913046.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17a380a5f---28805037277.pdfIn PDF document text
- http://rszm88.com/upfolder/e/files/20210713042313.pdfIn PDF document text
- https://kvkumariajnkvv.org/singhania/downloads/file/vugelitirevawemebab.pdfIn PDF document text
- http://dichvugiayphep.net/hinhanh_fckeditor/file/33814741612.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1601827274---nejesipodifefutovo.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd083ed548---guvulotefubigomini.pdfIn PDF document text
- http://savalis.ru/userfiles/file/49714127557.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a431be64819---58650458780.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/15f148d5feec4d68b14a00f545613028/49103485200.pdfIn PDF document text
- https://imagebuzz.net/ckfinder/userfiles/files/58412958.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d5d519061---9030898680.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b78e74175---luzilotodifolowad.pdfIn PDF document text
- https://llsindia.in/FCKeditor/file/wikoluzaz.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db5604d00af---39359224006.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prophylactic+and+anaphylacticPDF 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_off0000f59c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF59C	18540 bytes
SHA-256: `a1c3516af400591931231075c26f3b8d5701669fa70f9290ba0e447c7529e4d9`
`font_01_sfnt_off000124a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013cb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CB9	10424 bytes
SHA-256: `4367d8dc5663eed7ab7c1cbbda74007ed18bc66e63b1f4020632d3d5abec5596`

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