PDF malware analysis — malicious · ac64b9ca6b8ba057

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 21:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7389a46bba93bf3f427d4757421726fc SHA-1: 66c9b1a307c1c69141b8dd5c73e95d437d764e89 SHA-256: ac64b9ca6b8ba057cd1eccb9af9699bcfd0be08c5a9766d1c789fabb14d49fa2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to host and distribute these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

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.
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://garglob.ru/uplcv?utm_term=sits+well+with+me PDF link annotation
- https://neplatnasmlouva.cz/soubory/bofamidomiwafoguti.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64131504fb---10365578383.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d001b3a69---70766571994.pdfIn PDF document text
- http://camionespanamericana.com/userfiles/file/satedagotogu.pdfIn PDF document text
- http://pokemom2.com/uploads/files/91015907613.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/jifopapidunukaberikep.pdfIn PDF document text
- http://colorfusion.us/admin/images/file/14079338375.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/vubofemevuzojubipezip.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf05e8398---99698483107.pdfIn PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733179dbd82---54515040362.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/d14s4m8q1ml3n8m5adpole6d64/vegejirotonetoniremulejus.pdfIn PDF document text
- https://naucharts.com/ckfinder/userfiles/files/gaguniwedug.pdfIn PDF document text
- http://buildinggodskingdom.com/webcms/file/mupekekekoginifeju.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/zilonigige.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee9204261---29099488225.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ab603141acc---48984958205.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ad3h19o8dt583sl35ce410bu51/lujokajupaxagiladi.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/9b727d0196d5bb44db189cafb7787a76/jamovasor.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c6bae73c---dudixojifagiribuz.pdfIn PDF document text
- https://remoteyourstaff.com/calisma2/files/uploads/59179772745.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/teximaritufu.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481327679d---ziwibemuton.pdfIn PDF document text
- http://k-yoga.org/file_upload/spaw_upload/file/20210510035614.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69010e818---kuluzajirefubugijadis.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30a1eca62---woxemi.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f20d577d70e439f93208877ccb7f81b/xojoxirametipikesi.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_off0000f2e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2E5	10048 bytes
SHA-256: `2d625f6769c75f33feaae7aa6b434561b0e5d7bad7e7d8c7e236083387f7396b`
`font_01_sfnt_off0001093d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001214f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1214F	20208 bytes
SHA-256: `4ccfc79c4cf8fb911836497f9e93d30b233d279112c1d4156bf409bae39f5421`

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