PDF malware analysis — malicious · cd1dde0cad96d33d

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 10:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: aec9d88d6209d928f83cebdad9694dea SHA-1: 874d3292837fa7cbd6cb9b6174c372d54ffcbfe8 SHA-256: cd1dde0cad96d33d263c9488ef89552efef8c6dd24ebdfd1aea590289a75a31c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or lure users to malicious content. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://aihr-iadh.org/uploads/FCK_files/file/tiraneruxig.pdf In PDF document text
- https://yarpaket.ru/userfiles/file/68293912948.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vscb8pfuumluh7a7ur24597c92/vewipivag.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b489e9c9c---29398822287.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa43035749---patasujedalikikakatekasun.pdfIn PDF document text
- http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/tojizi.pdfIn PDF document text
- http://ibrahimalsada.com/pics/file/tufanuzawikowuv.pdfIn PDF document text
- https://childprotectionindia.com/lexcyberia/userfiles/files/noliwabevivijemowig.pdfIn PDF document text
- https://northwestconvention.cz/data/files/33426864948.pdfIn PDF document text
- http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimilafujuxojogevonak.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ubsrd03l16paomgpij9i6h11e9/36479966787.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de660ab7a5---saferutuwox.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3c18ea04---zalaleza.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/be28975b533f131d3bf99b847a7de968/71164919822.pdfIn PDF document text
- http://richardchong.com/userfiles/files/dedufujisevamugebop.pdfIn PDF document text
- http://thetsaban3watnuea.com/UserFiles/file/14899547496.pdfIn PDF document text
- https://irepairplus.nl/app/webroot/files/userfiles/files/59048306209.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f4563c6ae64436f0087edb54ea68dcee/wonaxuvasox.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fca285dc9d06341050ec655c0b260552/44688849797.pdfIn PDF document text
- http://timeyear-v.com/userfiles/file/fotelo.pdfIn PDF document text
- http://gruppocinofilomarsalese.com/userfiles/files/nabunumupakobojamodowatus.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/vasere.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4fe4a6a9c---viroxosomezilirogaz.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8ceb9cf90---41136671128.pdfIn PDF document text
- http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
- http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vetuzodi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=food+beverage+and+tobacco+manufacturing+award+2018+pdfPDF 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_off0000bdfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDFC	11620 bytes
SHA-256: `baf52c01ebe578cacc002f0819a7476a031a424720341907aec1614073c87a09`
`font_01_sfnt_off0000d95c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD95C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f16e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF16E	16736 bytes
SHA-256: `d62d0f7334aaeccdd337108745307bb0c5adf7ac115343568221fdaed2e49b7a`

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