PDF malware analysis — malicious · 640d786a8fd61d81

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 19:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 524a247d324eb3a44d8ec71c94eefb7a SHA-1: ae6a4eef043ee7e3e608e7d58d2b2dd84423ade5 SHA-256: 640d786a8fd61d81e971bf77497e69eec5ffb5537e3582b562bfdbb12ded2123

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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=fortnite+free+build+map+code PDF link annotation
- http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/60106444316.pdfIn PDF document text
- http://palakkadtourism.in/ckfinder/userfiles/files/vibitaxapudonetenadasafi.pdfIn PDF document text
- https://myreply.mobi/snappshott/editor//file/xaruwezizin.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac9d6f045---26339132815.pdfIn PDF document text
- https://photopoligrafic.ru/ckfinder/userfiles/files/dejiposigom.pdfIn PDF document text
- https://workinhotel.com/upload/fckfile/38289830021.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fd27be71a8f4ed52164c72dc9b846e5/73783013363.pdfIn PDF document text
- http://tyextractor.com/d/files/kamajelatatuket.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/59058228302.pdfIn PDF document text
- http://mansiya.com/uploadfile/files/76783662353.pdfIn PDF document text
- http://ambartakip.net/belgeler/file/zefakopekebiletidababe.pdfIn PDF document text
- https://latgalesamatnieki.lv/files/file/82959194865.pdfIn PDF document text
- http://nadafashionbelt.com/Uploads/file/3473820268.pdfIn PDF document text
- https://phoenixturkey.com/upload/ckfinder/files/5505042918.pdfIn PDF document text
- http://artsar.pl/userfiles/file/tafiferabokovuj.pdfIn PDF document text
- https://rintrans.com/files/lepusaf.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/wobutuzezisedo.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/50014189599.pdfIn PDF document text
- http://futuralagoparking.eu/userfiles/files/fopagixejikabojexafogop.pdfIn PDF document text
- https://indiantiffin4me.com/nbloom/fckuploads/file/21159034765.pdfIn PDF document text
- http://stmarysharipad.com/userfiles/file/gefisibitazirixiwuw.pdfIn PDF document text
- http://sumosushingrill.com/uploads/files/96640358571.pdfIn PDF document text
- http://kozszemle.hu/uploads/files/xijerisololiroluf.pdfIn PDF document text
- http://fatename.com/uploads/files/202109162325246323.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7l1tua7uqt5vbpa4qcaijmdc9a/safamanit.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_off0000b1d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1D0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c9e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9E7	10832 bytes
SHA-256: `030c0b3cd495aafc4e430b6d653990d138b7455542c52d626f935a621bdaba31`
`font_02_sfnt_off0000e293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE293	15056 bytes
SHA-256: `ed0072561e0c86c02760c22949f5d43fc184e7fe7e22d818662f0567096f407d`

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