PDF malware analysis — malicious · 09ffb143c593b670

MALICIOUS

PDF

75.9 KB Created: 2021-08-08 10:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 3548e232fd45dff2c1a90634525eed04 SHA-1: 509fa1ef77da93d39708578099f17b872aaf2895 SHA-256: 09ffb143c593b670cd382ba34f43efca1e1c09b0941663a88874283042a407cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e525af972e2a3716e4c1cbb0f5780d9c/lanereful.pdf In PDF document text
- http://murzilka.biz/images/uploads/file/19600118110.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17e8bba6d---78991514897.pdfIn PDF document text
- http://logtech.cz/foto/Image/file/1018187205.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59e48ce969---63338851555.pdfIn PDF document text
- http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/74278345644.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kmppcu753sukcr7b5hq2fa4ov/37104881487.pdfIn PDF document text
- https://butterfly-propertymanagement.com/userfiles/file/3331568650.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pr6fcsgi6s6kfil3micdaq6bd0/36177011630.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079477cb798d---77096282410.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f187590a5---xewokavoxuxokudid.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/494fd3e0531cd445328e5d4c135ea6c0/kawatuje.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735ca19f068---vorokofupap.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/83248260218.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4370791f1bfadc8786bde546ecce8bd0/268925416.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/75066efe6f964e3c0f8006b95f823310/9105817247.pdfIn PDF document text
- http://aquatrustfina.com/userfiles/file/96551730182.pdfIn PDF document text
- http://hopkins1983.com/clients/861771/File/gabezixigiwewuxubipu.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/616f708238b7215f392a0b3dfc4192a4/fuwizopigurovasenatunir.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ffcef4ba8ca4bf14e9c1bac6637e116b/24513703969.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ee0ec90603691e9bab60498472b2af35/fisatisanaverutefapotige.pdfIn PDF document text
- http://aftckwt.com/uploads/file/figawalemewobazebixusuxe.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/91bba43b4ad9e7f00fb98d015aa554d5/jolinezedexor.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=myles+munroe+relationship+books+pdfPDF 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_off0000c37d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC37D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB8F	17060 bytes
SHA-256: `f608ddb9dfffaa332a6f5df0e22a7282259f7fd547c3cb4a7cfd925d6a502c53`
`font_02_sfnt_off00010729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10729	11200 bytes
SHA-256: `161826d4e901d74c489507c474f6c8149223320cfcede64ea1cabb1f208961df`

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