PDF malware analysis — malicious · 9593400bc8a571a1

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b8c8545730f5c4eac109866a94c65507 SHA-1: 922e7af680f9ed8f20dd70ab74cc171fdddcbd22 SHA-256: 9593400bc8a571a1304bec8b7614eb33a684cd4cb37b7600782f4e22ae5ce9ec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document's structure and embedded URLs align with a spearphishing attachment tactic, aiming to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=rejection+message+after+interview PDF link annotation
- http://gursakaryahukuk.com/images/file/52558698264.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4e14e6b20ca1e5f0a2d3813aaad3fc87/5371671376.pdfIn PDF document text
- http://madonnina.info/userfiles/files/rapegaxuberi.pdfIn PDF document text
- https://by-express.com/upfiles/editor/files/36246060448.pdfIn PDF document text
- http://rent2day.ca/ci2/userfiles/files/meboganoxovurirajujuk.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47fe7855c4---zixasapaponewufamisitib.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5c9020e1bcd7bd3b284d74606b533447/89774574491.pdfIn PDF document text
- https://arhometutor.com/userfiles/file/voriwoxi.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/18123044683.pdfIn PDF document text
- http://kasaitogo.com/uploads/files/95079366661.pdfIn PDF document text
- https://allmassage.net/upload/file/20210516100536.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26e831be---49015295225.pdfIn PDF document text
- http://think6.net/ckfinder/userfiles/files/20210816020114.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/podix.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/28562654673.pdfIn PDF document text
- https://www.padanguparduotuve.lt/ckfinder/userfiles/files/82711000918.pdfIn PDF document text
- http://minhanh.com/files/zisozemakudawoku.pdfIn PDF document text
- http://rafaelstore.ru/upload/files/75757119394.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9030afd108dd35e0ea23cb565842b558/fewelikumutujope.pdfIn PDF document text
- https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
- http://quanhoangtsi.com/upload/quangtri/files/38745024576.pdfIn PDF document text
- http://lhsclassof68.com/clients/73441/File/53191847602.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1249d03c9---gepomorosininag.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_off0000dcdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4EF	17328 bytes
SHA-256: `16efaf7ef4f6404c26ee93957183bdd42074e85820ad3ecf4e73c9e38099aa28`
`font_02_sfnt_off00012165.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12165	10960 bytes
SHA-256: `e8a4af94c65690193dd156a6f902202df3490c86e8f8b5aba1226bf74df832d5`

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