PDF malware analysis — malicious · 61bfdfb1fd3a8e32

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 08:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f4d49b83ed821babd24cc8961bc490f5 SHA-1: e24fae441828701032a626325e4b424d12358f8b SHA-256: 61bfdfb1fd3a8e32e080f2f3110f41514d49c54186e33f4d8666b11d37678be1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is a lure document.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=bissell+proheat+2x+lift+off+user+manual PDF link annotation
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e808703a68aba97b643a136073aaa61/44735075140.pdfIn PDF document text
- http://khonggianxua.samdigroup.vn/app/webroot/upload/files/53042124798.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6evq1sbuli4kphn4d3t6424vi2/fulabufuzifelepororinuku.pdfIn PDF document text
- https://divinenine.net/userfiles/file/tuborifixijonujil.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612584006f473---28985928822.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607027940114f---powepozomuvisaxovi.pdfIn PDF document text
- http://moscow-vernisage.com/files/files/likezowepapufumamuba.pdfIn PDF document text
- http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44191343000.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9babb5ea57a3b4ca72da00abe3118a5/88868935808.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3ad44d40---14333248731.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f82678dbb---1586392812.pdfIn PDF document text
- http://hostingureitings.lv/uploads/userfiles/files/gupufejabilibejokuronuj.pdfIn PDF document text
- http://cpils.com/userfiles/file/2735480569.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927d4452c3---patiri.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a492b4b04c5---jotirapelumaripofujuxom.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/zuzofa.pdfIn PDF document text
- http://huiking.cn/uploads/file/211735026449.pdfIn PDF document text
- http://skinanniversarymall.com/userfiles/file/fotosakufaxedibufugavuf.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ktatlona2k9tirf70rg2v81nn4/gogupexogilujemenow.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5sdtq6guljbvcnr1pt3lvl9p6c/8581928143.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/02cd4e5ddfa67ef4126657106bfed5a4/61875355725.pdfIn PDF document text
- http://orgue-chantepie.info/FCKeditor/upload/file/valifafanetisix.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b186f829600---23823131466.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/acfbe68b42096024c9f3060cf9fd4ae0/45695362080.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f97b0c07---vedimuxuwabiw.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_off0000bde3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDE3	16932 bytes
SHA-256: `be53b8e1ac996fa4c928b14367284b13e9cf440d5e75b2c59595c53feafe656e`
`font_01_sfnt_off0000e852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE852	10996 bytes
SHA-256: `bc9933478136e7a561a2337bda01dfd20fcb7afb3b875420a752260d35fb82b3`
`font_02_sfnt_off000101ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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