PDF malware analysis — malicious · 43f2f884033f6974

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 10:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: cb174b21c102f0fdf98f119bf080af3e SHA-1: 17dcfdaf8ef4c0b5c9967fad85e2ea6a854cae98 SHA-256: 43f2f884033f6974008e2536fe1f3645bfb60e56b0afc21b6b002e156c8b727b

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://irlanc.ru/uplcv?utm_term=batman+telltale+series+game+download+for+android PDF link annotation
- http://designerhouse.ru/upload/files/86749805705.pdfIn PDF document text
- http://btsoft.vn/uploads/files/titefudukexezar.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rduegur1f5i9aghofuils35t17/xopejudivowavubojelok.pdfIn PDF document text
- http://proximeo.com/ckfinder/userfiles/files/56475545077.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/59208080662.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g6849c368e3c1toipt3tu6ftd4/kalemakinirekonisolomanep.pdfIn PDF document text
- https://pre-www.bridge-academy.com/uploaded/ckeditor/files/56765639820.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355813ab160---35729569626.pdfIn PDF document text
- http://tantos.jp/js/upload/files/38516632782.pdfIn PDF document text
- http://benthanhsgfarm.net/images/uploads/files/xemejunewev.pdfIn PDF document text
- http://gradn.ru/uploades/fckeditorfile/17264833901.pdfIn PDF document text
- https://nexapos.com/upload/files/5876250344.pdfIn PDF document text
- http://gdgom.com/upload/file/210918025341139660hn6566lxg5wt.pdfIn PDF document text
- http://yizhu580.com/ckfinder/userfiles/files/kojixapiriziramemexo.pdfIn PDF document text
- http://movesearchesuk.com/userfiles/file/78635218538.pdfIn PDF document text
- http://hosungtour.net/FileData/ckfinder/files/20210910_8770BF1A6E7ACDC7.pdfIn PDF document text
- https://hoya.hr/UserFiles/file/jadur.pdfIn PDF document text
- https://exihomes.com/userfiles/files/fafobunevuzuwezesu.pdfIn PDF document text
- https://masihpt2.com/contents/files/429651752.pdfIn PDF document text
- https://carrieres-pierre.com/userfiles/file/28768398389.pdfIn PDF document text
- http://denda.co.kr/ckfinder/userfiles/files/fafapalapewejanixoro.pdfIn PDF document text
- http://ippon.lv/uploads/File/76211479215.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f0143c43b0c9ed22a5509e257d3442a1/zomonixemenuxub.pdfIn PDF document text
- http://peter-scherer.de/userfiles/file/97051796886.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_off0000d73e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD73E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF50	19096 bytes
SHA-256: `b10e422386d9d7d1301a3482fd1d8cb655c6de2a31ee109ad14a13363a4f10e3`
`font_02_sfnt_off00012193.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12193	10836 bytes
SHA-256: `f4630c4a0e116e19d49e746d19a6f125c0340725e5f559b4d5429c45f9197255`

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