PDF malware analysis — malicious · 0ee9ff580e6b6d44

MALICIOUS

PDF

160.9 KB Created: 2021-07-04 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8c2a5e61c967448d6cc96e470b5cdc58 SHA-1: 3b2e89b493c5d145e2fca60812a1cadf8f583f27 SHA-256: 0ee9ff580e6b6d442cda0ebbd3ee25fb34c99fdcb2ca5598073a5408cd013bf0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9271

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8f7ifc9fkksgais2etp8agh3u7/navudajefavutilonase.pdf In PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vupf3iao7muplatqdr7u5u5912/49741748962.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e202d3c28---waropufiminaw.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b134bb379---rezumirokaderivitit.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9169d30fb---59011355239.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff6ff329b---kejazurarufukij.pdfIn PDF document text
- http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tjaqsfe808ucm0tmo5jh72js20/lijibavugesawu.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/791488e0a44448662c2049310d662c27/lasonujozivedi.pdfIn PDF document text
- http://beiwendq.com/userfiles/file/50802245695.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/lifipisujafidu.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/04620dee765c80578647ab3357b9f2b1/56661316705.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m0nb0k3cjde5918su2anal7tn4/24519416284.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/25838999633.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nm1433g1sa2gd38j36fia28sgl/66879454213.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f620e2cbc2---zojapizowisolosepiz.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7jqeqe1l0qpn40cg1qr8kvukgf/87299226907.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e11b59425d---87610826320.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78a3edee53---48149708326.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/36108112154.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160832af145c05---bezufedategitulutim.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431aa67f6b---ravevamoguporedarotemar.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e362657---98406822300.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/276b5bb0b0477caa3fba2d3cb505d4d9/lekivinunupafola.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978c5829de8---54330992062.pdfIn PDF document text
- https://noihoithanhtuan.com/media/ftp/file/40898170229.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=prince+of+tennis+national+tournament+episode+26PDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000160fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x160FE	58084 bytes
SHA-256: `f90229266fde5e8a83d68f9d720a3780f49048615b00f2076613e4e32c2e952f`
`font_01_sfnt_off0001fd76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FD76	17976 bytes
SHA-256: `aa7a0726e0d1beb9754b95874b1d81aff31d8ae11a8bdfd199b8e037fd6f2938`
`font_02_sfnt_off00022d48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22D48	11172 bytes
SHA-256: `70cd924a4ed427b63c8a6939a35a02549042533cc4d5d4997e95b14bee03b141`
`font_03_sfnt_off00024767.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x24767	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_04_sfnt_off00025ce3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x25CE3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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