PDF malware analysis — malicious · c8bd4825f795858c

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 05:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ca8064ee556519583a6cf84df65fcc99 SHA-1: b5cc5e580ecfd9ab2f5c50216b8bbfc6630634a4 SHA-256: c8bd4825f795858c2cca8c755e89b8938ba3b0a0ced1be1ded712208d674c89d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=filmywap+justice+league PDF link annotation
- http://belloverde.net/emailer/file/3738107083.pdfIn PDF document text
- http://smartraoptics.com/fck_filemanager_upload/file/9629551272.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/32409828950.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2328e5fc---gagukamew.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86016fbc3---wurufikovava.pdfIn PDF document text
- http://www.sudaff.com/pics/file/36931450893.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4731afd1---tikojonog.pdfIn PDF document text
- http://aardbeienfeesten.nl/uploadimages/files/78116104263.pdfIn PDF document text
- https://afra24.com/basefile/afra24/files/dujum.pdfIn PDF document text
- https://ptogel1.com/contents/files/57162649604.pdfIn PDF document text
- http://drairtools.com/ckfinder/userfiles/files/88102637629.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/fedowumedinubisimukivuj.pdfIn PDF document text
- http://104408017.linker.tw/files/linulutobowasagedusebefo.pdfIn PDF document text
- http://veterina-naslunci.cz/userfiles/file/xufuwos.pdfIn PDF document text
- http://coimbrasoftware.hu/images/uploads/files/75475449539.pdfIn PDF document text
- http://reichspfarrer.sk/file/buxovimolulav.pdfIn PDF document text
- https://listocrm.com/userfiles/files/93128769060.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905073448408520.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/376b35297642121bdd46334416b009ba/fejuzububodagu.pdfIn PDF document text
- http://www.39koratmachinery.com/file_upload/files/77720355582.pdfIn PDF document text
- https://saigonservices.vn/images/uploads/files/xegudepasijaxevog.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1415e8af5---lemaropimakerelidobadide.pdfIn PDF document text
- https://aiwatopup.com/ckfinder/userfiles/files/feforopavamebolulo.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d30e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD30E	10800 bytes
SHA-256: `98cd4862e4271f09e4548f715c223e3347a2e25a46ba62f7705f533a39b0c0df`
`font_01_sfnt_off0000ebfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBFC	17384 bytes
SHA-256: `4ff66b35e34530fa487e8be623bcccfb852342ccd950839a217be3006d05370b`
`font_02_sfnt_off00011917.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11917	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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