PDF malware analysis — malicious · be450b4871e1c111

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 14:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5225fe41c257e40b15de1e8a7c1cb9f1 SHA-1: 27fd09b95a6a7463ce955eeb7afee842347ebc2d SHA-256: be450b4871e1c1114fbf107e1b349e20813bff72b58c403894fc68792e6717e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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 http://burelomdo.com/ckfinder/userfiles/files/guvabukav.pdf In PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/tamegumifizonosepomuxewe.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b5a33b108---66425003513.pdfIn PDF document text
- http://angeladaniel.eu/uploads/files/44589302995.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ab241c05---70723423163.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f723db850a0ac0c6b76d629262e83652/21800002347.pdfIn PDF document text
- http://kurskodkb.ru/page_edit/_samples/userfiles/files/gobodubo.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/853a5159beedefca0bdef9a17d4a824c/51910563470.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f13a7a9c---4323125655.pdfIn PDF document text
- http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160705b998a40a---41252151649.pdfIn PDF document text
- http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/36173809529.pdfIn PDF document text
- https://istanajpdua.com/contents//files/19343220704.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0acd807d---vojopekowiruwoveloriwa.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/tafutumexirabeti.pdfIn PDF document text
- http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/wazuba.pdfIn PDF document text
- https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/duralekadavoz.pdfIn PDF document text
- https://gencshow.com/upload/ckfinder/files/32797368787.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1d9bb93464c46d76baf51ac368e86917/73356210603.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1611a28fa99195---bufopafeviwimobuv.pdfIn PDF document text
- http://lotusburbank.com/uploads/files/66708093132.pdfIn PDF document text
- https://petala.gr/userfiles/file/42086342873.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210705123706907.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abd88752c---tepovujodoz.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/tuvebaw.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b4b68c08---40711581091.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+date+in+edifice+casio+watchPDF 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_off0000e7ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFBF	17032 bytes
SHA-256: `5957d91179a422d337063bc62cf0a7c023a0a046bbeb7d6619a3a632f51ec3f1`
`font_02_sfnt_off00012c43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C43	10504 bytes
SHA-256: `41396b4a67f6ad47a9d00c95082fa380cb5d71e431965453772f7d1dd31a7c3a`

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