PDF malware analysis — malicious · 82c777fcd026978b

MALICIOUS

PDF

104.1 KB Created: 2021-06-27 06:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 5e13d0ff9595ced8faa2907905f97cab SHA-1: 8cfe6e425adb5044d1b61bbe0ec24bbd5d2523e2 SHA-256: 82c777fcd026978b8df5d68e1b2d784f60d9a09dc11b69cfe6aa24192b0593c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://crysiq.ru/uplcv?utm_term=quiz+diva+country+shape+answers+2020 PDF link annotation
- http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/36245588026.pdfIn PDF document text
- https://loctra.net/userfiles/file/zesagotujidotovifademino.pdfIn PDF document text
- http://shuimotongyuan.com/userfiles/file/lumabofokujavugi.pdfIn PDF document text
- http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jugemaleduxon.pdfIn PDF document text
- https://marljivo.hr/userfiles/file/wiwadejapemawejike.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e096ba7bf731cba2ff49e0889173a09f/8973315970.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bfe74f55d24e96e62a2f1d2772685fd2/53927462634.pdfIn PDF document text
- https://burgaseguros.com/userfiles/file/dirafowazapovuwarev.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/evlbti2ehm10gtstecc6g1lemo/dekebizok.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8f11f06e33c5d75b118d5a25bdb56cf2/newepanitokorolojo.pdfIn PDF document text
- https://kede.org/userfiles/file/muboxiputova.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7723ce00---lozowisavi.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ecae1276---36504707649.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f9c89bf---3728932737.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1db9e10ac---6845400030.pdfIn PDF document text
- http://olimpic.hu/ckfinder/userfiles/files/tapipakokorape.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c38f70b46---wewile.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e169cbe44e---tugeporejog.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072da575f0c5---nazasez.pdfIn PDF document text
- https://festival.bg/fckeditorfiles/file/20360235989.pdfIn PDF document text
- http://ferrocom-spb.ru/userfiles/files/sonurevenozig.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90ed31df1---muwobiwapegajupugovoja.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608c752f71f3c---xeresokosoxutegozazij.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c68764a8521---wegobesasemed.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/46da5ac47c822aa84b366cc6c42ed67b/foxawerutaxixev.pdfIn PDF document text
- https://cryptoworld.gq/In 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012a5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A5F	21420 bytes
SHA-256: `3ae5ea8ccbb4e6e8ab9f9dbd09b7e505221f1a00056d1a6d0d68ebccdf74030d`
`font_01_sfnt_off0001600a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1600A	11292 bytes
SHA-256: `c2842f40ed20bc80dd2bcad7cb7a293c8574e13c8b99c95c46112bf3c1da896c`
`font_02_sfnt_off00017ad2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17AD2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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