PDF malware analysis — malicious · dcef794a447cf62d

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 20:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e840a5a2161028e17521f1c19ec485c2 SHA-1: d8118cd6e1048fee924ef55e6166acde5f92af3e SHA-256: dcef794a447cf62dcd2797da4130fc6e3288a75ee22b848b19bb7c443cc32030

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=graphing+polynomial+functions+worksheet+5.2 PDF link annotation
- https://mayxaydungthienlong.com/uploads/files/files/73241368981.pdfIn PDF document text
- http://daming-school.com/userfiles/file/mozodifegitogiravobub.pdfIn PDF document text
- http://wasserburg.pl/userfiles/file/53313465102.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16117ead454f42---81756080587.pdfIn PDF document text
- https://juraganmonyet.com/contents//files/37362758846.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/mezab.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/pozerujesudinuwizoma.pdfIn PDF document text
- https://mimpishiosatu.com/contents//files/sixev.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c08a0aae1d586da7ce91b909ded6fd73/fugofibenelojeteselijorer.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dceb03b1f5609e0af9d529f37d6423ea/59394267836.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8f130a47e43a41148a0c6ec723e467dd/lemewavipimerilerojag.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/458ac5d4cd034879e91d5e6315498ac1/besikezinapujawani.pdfIn PDF document text
- http://avstralianature.ru/ckfinder/userfiles/files/72364352079.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qur98e5i152bpj9p7akvh207kt/surijazanig.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/598254fa15b9b630b974f0f45cc2d660/74658906020.pdfIn PDF document text
- http://qualityspices.in/ckuploads/files/67031890789.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91269a3a---62735647905.pdfIn PDF document text
- http://ventss.ru/userfiles/files/59328025090.pdfIn PDF document text
- http://avandcie-automation.com/ckfinder/userfiles/files/vibur.pdfIn PDF document text
- http://khautrangkhangviet.com/upload/img/files/73882695744.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a67abba0a---mijex.pdfIn PDF document text
- http://greenplanetnepal.com/userfiles/file/degebobil.pdfIn PDF document text
- https://damsindia.org/admin/uploads/file/munukigevokoludijadubuxu.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2e0bef0e---89177503586.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/91958207445.pdfIn PDF document text
- http://jinanxintiandi.com/userfiles/files/kazogodaduzebisetosul.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_off0000cfa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFA8	11676 bytes
SHA-256: `b9ab1126ac1adbf8bfcb406a1c123d5c6984a8fe099705bef75e44b74ba2989b`
`font_01_sfnt_off0000eb7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB7E	17516 bytes
SHA-256: `a5124391bab955f2fa001124d1e3cb23feab76c8d44f3e5c8d67b5f89574132c`
`font_02_sfnt_off000118fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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