PDF malware analysis — malicious · ff417cbf2afb32b9

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 13:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4967317124f5ab94925c707659789bf6 SHA-1: 5354d0d5f7be27f0c1a2c53bab05d152fb9e38e7 SHA-256: ff417cbf2afb32b971466fde85c4e172c83b929fdb63045180400448d69f72d0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=app+contestador+automatico+android PDF link annotation
- http://macautemple.com/userfiles/file/vaguj.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/57025635058.pdfIn PDF document text
- https://auto826.com/uploads/files/tutaxonajepipel.pdfIn PDF document text
- http://2017.letnifestiwal.pl/ckfinder/userfiles/files/28605426389.pdfIn PDF document text
- https://silverbirdmarketing.com/pages/images/file/luvugagesawamipub.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lf18t1ajtf39ubqrurpg4gb6iq/75654206683.pdfIn PDF document text
- https://xinpayflow.com/ckfinder/userfiles/files/40469183911.pdfIn PDF document text
- http://kp-technik.cz/ckfinder/userfiles/files/17125639760.pdfIn PDF document text
- http://grimastone.ru/files/linusotewexupuxi.pdfIn PDF document text
- http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusojiros.pdfIn PDF document text
- http://nagymester.com/userfiles/file/54673632730.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313086e6be---28201202960.pdfIn PDF document text
- http://mishor-uvk.com/uploads/files/70301783143.pdfIn PDF document text
- http://herfon-machinery.com/images/ckfinder/files/20210904211338.pdfIn PDF document text
- http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/rakivujex.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b880556ad6d5cf8c910e4bde0610eb3/44790196368.pdfIn PDF document text
- http://lovesenergy.com/file/xoxebulep.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/wesepifiwuvu.pdfIn PDF document text
- http://cuacuonductudong.com/upload/files/28144829233.pdfIn PDF document text
- http://somsit.com/ckfinder/userfiles/files/54695241541.pdfIn PDF document text
- https://collinite.pl/userfiles/file/fixenuriwot.pdfIn PDF document text
- http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/topeliwazakiwogikafo.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e0j186b99angm09et17lqaecmi/topuwapafot.pdfIn PDF document text
- http://liveisagenix.com/ckfinder/userfiles/files/posamiwiboru.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_off0000b670.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB670	10712 bytes
SHA-256: `43ecf6270624623f2c4a462bfd0640e7c64d7be9d8a9a4170ac6d8506f8bf004`
`font_01_sfnt_off0000cf0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF0F	14228 bytes
SHA-256: `eb151a14ee2da8c18db7132d9861bfd99b10d45a575199e01795699a05850da4`
`font_02_sfnt_off0000f296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF296	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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