PDF malware analysis — malicious · bd57f9708af4cd49

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 10:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 70d9b9f1a29d5d37397c3d33f4343345 SHA-1: 7f4211675933846408a334a42021c224a91b4a7e SHA-256: bd57f9708af4cd4963c3ded7f4e5312b370c0db5700e53d46a074bc243780af0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving phishing or the distribution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://catamma.ru/uplcv?utm_term=ultimate+stickman+battle+simulator+mod+apk PDF link annotation
- http://gramercygrand.ru/files/file/jejiburusamimamo.pdfIn PDF document text
- http://vedepcuaem.com/luutru/files/34433776970.pdfIn PDF document text
- http://whdhgs.com/uploads/file/20210903160451577.pdfIn PDF document text
- http://elpijisystem.com/file/58362337725.pdfIn PDF document text
- http://fobas.cz/userfiles/file/bokifatotakeno.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kvvukrdgv82m0p6mqphminfhk7/26822388346.pdfIn PDF document text
- https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sozokizafoja.pdfIn PDF document text
- https://hnhaa.com/userfiles/tnejp/files/luzevoxixit.pdfIn PDF document text
- http://tpokebar.com/uploads/files/pewibevirerolofamit.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/i88d0v56qqq1hhvr0ol989qsme/fotuzudo.pdfIn PDF document text
- http://mitsubishilongbien.vn/images/ckeditor/files/boxuviwikubojatipu.pdfIn PDF document text
- http://worldplastsolution.com/ckfinder/userfiles/files/68236271515.pdfIn PDF document text
- http://samtekelektrik.com/files/maretovivekav.pdfIn PDF document text
- https://cncunse.com/d/files/48162710180.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ee583227eb055b6e94244420334ae763/xinuru.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/sesinazinolutetikufu.pdfIn PDF document text
- http://cozycornerexpress.com/uploads/files/70333854452.pdfIn PDF document text
- https://coebmsf.com/userfiles/file/91494534648.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/os33u3gial52arltdaeohdcon0/71769830151.pdfIn PDF document text
- https://thai-airpark.com/ckfinder/userfiles/files/35866026682.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/21555226923.pdfIn PDF document text
- https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/21552769386.pdfIn PDF document text
- http://massimomoroni.it/userfiles/files/4133209045.pdfIn PDF document text
- http://serdceprirody.ru/userfiles/file/13072346246.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_off0000da73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA73	11012 bytes
SHA-256: `fb356cf9edc22ec53a49da8eb3d08a037f7ce55e6c380d828503785a0f97c9b8`
`font_01_sfnt_off0000f3c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3C7	18680 bytes
SHA-256: `b94dfc09f8f02891f7a3151c9f50d490da946d10e5e95b439ae5923466990743`
`font_02_sfnt_off0001242e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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