PDF malware analysis — malicious · 3e1b71cbba10da12

MALICIOUS

PDF

84.9 KB Created: 2021-07-26 22:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 9302b4f668c71cf4bfc078d37c941156 SHA-1: c4153fdabb24831194d0039a4484d4f6563840b3 SHA-256: 3e1b71cbba10da126f4c249d45a0b5a1f1b1bbea7935e7ce1ba254885e4a73f7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://prtl.pl/userfiles/file/77972943919.pdf In PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ac943dda---94946789684.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c75091020---dedotasokebew.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ef39a0ec65c95f9f724b2086b3a916d7/79411279439.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/7721130634.pdfIn PDF document text
- https://hunde-katzen.at/soubory/22287647925.pdfIn PDF document text
- https://restavracia02.com/userfiles/file/2199260408.pdfIn PDF document text
- http://polimak.pl/userfiles/file/70983039316.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/pevaloj.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nifroghq9hc24nvko26njff4bp/dubok.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607399db87fda---nugonanukevakagegekev.pdfIn PDF document text
- http://nitexprofi.cz/userfiles/file/dofubiw.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf2980df6---dafesowapigalekakuv.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/e2apc8ebe041dih0fe2otvrn24/57224472392.pdfIn PDF document text
- http://michelschuurmans.nl/images/uploads/file/55974673892.pdfIn PDF document text
- http://beijingxinzhi.com/userfiles/file/20210609105123_1276563407.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f5dd6c3dfec794f686c0c61edee83854/70900416285.pdfIn PDF document text
- https://progin.swiss/ckfinder/userfiles/files/69835452321.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/31379867399.pdfIn PDF document text
- http://brilspa.ro/userfiles/file///lotifo.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/81330284634.pdfIn PDF document text
- https://avvocatoboretti.com/file/89018383690.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tf5k2rnask5ul7mk6ft7h8pbh1/gazodijujorajitom.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=abecedario+letra+cursiva+mayuscula+minuscula+para+imprimirPDF 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_off0000e341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE341	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB53	19056 bytes
SHA-256: `fb414d24735661dc267a497971cba83ea418f146101d5aadf6de303fd0d2037c`
`font_02_sfnt_off00012bf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BF0	11076 bytes
SHA-256: `452e6e4333f54e58c0a97536a402ced1e28f60a6f23d2cc33709b2ec36fe490a`

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