PDF malware analysis — malicious · 5fccb98f1debec9a

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 06:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b8bfaf2e3c04d4e4da978aecde0a83e0 SHA-1: b8e7a6493db5af6935e730543c7c4b4e5c3960f8 SHA-256: 5fccb98f1debec9ae0ac1a3b429dc790ef92362867889de9b5c08e03a9e9efa1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, with numerous links pointing to PDF files. These links are likely used to distribute further malicious content or phish for user credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ba13d6be22f4dc7fc91f348e23792906/momevulezesaxixopekox.pdf In PDF document text
- http://crosswaysrecruitment.com/userfiles/file/faxagasonif.pdfIn PDF document text
- http://kimsanghun.com/upload/userfiles/file/2021913648106308.pdfIn PDF document text
- https://hefcom-hydraulics.com/ckfinder/userfiles/files/19958217014.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1e510df6cc68a63ae63b141131af875a/mibujinaveweruxuse.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915686ab59---56369480512.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ofjuba476f01uqhc4e8a24u6nc/mazurexuxipivi.pdfIn PDF document text
- https://portalbime.com/UploadedFiles/New/file/6867613784.pdfIn PDF document text
- http://landroverbh.com/ckfinder/userfiles/files/49644536199.pdfIn PDF document text
- https://www.agcontraincendios.es/ckfinder/userfiles/files/bedisunono.pdfIn PDF document text
- http://namngonviet.com/user-/files/49246807093.pdfIn PDF document text
- https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/7879732568.pdfIn PDF document text
- https://congthuonghotel.vn/app/webroot/files/images/pages/files/fonigafesorib.pdfIn PDF document text
- http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30172312919.pdfIn PDF document text
- http://salonmysliwskirys.pl/userfiles/file/kufigavowexikixa.pdfIn PDF document text
- http://lmnn.ru/userfiles/file/kafibodijekasawofavorekek.pdfIn PDF document text
- http://suliaok.com/v15/Upload/file/2021992237318228.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/belidukotiwi.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/gogexaxur.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ad61b8fd---jolavidasepoj.pdfIn PDF document text
- http://matchedtubes.de/userfiles/file/39092181823.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/92645066626.pdfIn PDF document text
- http://csc0311.com/userfiles/file/20210912062653_g8mk50.pdfIn PDF document text
- http://ncdesign.it/userfiles/files/romusexifixatogekodewo.pdfIn PDF document text
- http://tumwebthailand.com/ckfinder/userfiles/files/15115905878.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=drucken+von+tablet+samsungPDF 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_off0000dbb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBB0	10880 bytes
SHA-256: `726e68605556cc03ecfa41bdb5f530d70164ac92fd080bf0de6d51269e32946a`
`font_01_sfnt_off0000f4f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F1	18392 bytes
SHA-256: `2c585b5eb38789499f0113edd7f98e602b9b3de0b03cd02bc6018c28243c2f90`
`font_02_sfnt_off0001234f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1234F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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