PDF malware analysis — malicious · dfb688948762636c

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 11:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e9749caba868126d6ae09533863789cb SHA-1: 0faae1f7586b333b93342ed86e1dec46e033b231 SHA-256: dfb688948762636c4ad7f111bcd43bbff1da2cf9145f7ff7f1fefce7c42772dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9737

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://infrive.ru/uplcv?utm_term=nephrotic+syndrome+pathophysiology+pdf PDF link annotation
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9b86315ff106b142e6b1691e53dc3d0a/9951781091.pdfIn PDF document text
- http://csc0351.com/userfiles/file/20210814224658_kilnzc.pdfIn PDF document text
- http://zkmeiqi.com/admin/ckfinder/upfile/files/24304869045.pdfIn PDF document text
- http://wsm.hk/images/uploadfiles/file/36535628061.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ae41791fc969424a2d7737d526912a9b/kagixasupodirevotevof.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7cb98e02ad0768008f08fb36b399b8bd/22743895640.pdfIn PDF document text
- http://vwtint.com/userData/board/file/sojomeledetusage.pdfIn PDF document text
- http://ats-dz.com/userfiles/file/28757651105.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19f010607---35391427072.pdfIn PDF document text
- https://nvsrolko.org/ckfinder/userfiles/files/13713347408.pdfIn PDF document text
- http://sungsam.net/userData/board/file/pikefimabudixujalijomet.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/fedoketevu.pdfIn PDF document text
- https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/t2sc959hgnge44rr4m458l6ic3/xexefiniwikitemuzikena.pdfIn PDF document text
- http://nickelsgrafikdesign.de/ckfinder/userfiles/files/27571808191.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93a675399---xikipirutetexurulonofok.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc8d8ee61---41602873336.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/2926827237.pdfIn PDF document text
- https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9b0cd7cec34419bcf9d88ff1ba73fb78/89729276268.pdfIn PDF document text
- https://at-studio.tw/app/webroot/userfiles/files/20210720_211848.pdfIn PDF document text
- https://galerie-louise.be/userfiles/files/5872672490.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986818461ca---jiretekowobetakozetotab.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113a9c75a6dd---3653644018.pdfIn PDF document text
- http://myphammonly.com/luutru/files/50020542599.pdfIn PDF document text
- http://sten.kr/club/data/userfiles/file/20210728040718.pdfIn PDF document text
- http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/46474317987.pdfIn PDF document text
- http://galenbio.com/images/upload/file/62242875078.pdfIn PDF document text
- https://equinox-e.com/upload/files/nunawojifadixul.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c08e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC08E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d8a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8A0	16448 bytes
SHA-256: `0faa7a9a7735622d191237b63c50b8597c3c3c33e8dc25ecc2f85a9776e17157`
`font_02_sfnt_off000102e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102E8	1980 bytes
SHA-256: `6acdf68ec99ca3c2a272b9f756ea0534bd524f6b790101e77b8e0f989f3f9b87`
`font_03_sfnt_off00010bf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF2	11160 bytes
SHA-256: `870ffc52c2ac4421b64ad8a235a406d4eecf65399cd971c48eccc97544723267`

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