PDF malware analysis — malicious · 079f8b9a61be45df

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 19:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 5ee99cadd9b21ad112e156d50b16ea70 SHA-1: beca0e0f84e8bf0205321e84dff0c1c5d3ee334b SHA-256: 079f8b9a61be45df84a79b2f6f66a7b218dfe4a0941dfaa3ac5c29b87daaad1e

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://coretry.ru/uplcv?utm_term=need+for+speed+underground+mac+download+free PDF link annotation
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ae101bc340129299ab5345dc0c14cb30/84825032608.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c8f3adba---tuvovufebiboxo.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/95d386f03f9f0385c8243e55a70a218d/gisitivapebugemefexetu.pdfIn PDF document text
- http://turskazka.ru/ckfinder/userfiles/files/lopiril.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/8278778018.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af584188---biwagunefevenedusab.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/daf32a51c1b3f10270c95fd740868824/14062787993.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59c027b45---dovewazenizomisan.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/860c0cd3d240de611a0f6ae2325f703d/juxonazabepole.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/01387ac3443e7ee305cea88461804f97/zaner.pdfIn PDF document text
- http://ip-golubev.ru/ckfinder/userfiles/files/89203317424.pdfIn PDF document text
- http://chinazzjx.com/d/files/xadebaralekurek.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf40dc738---99453009022.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1c0e96aef3b320f33f3acd8a68fd8e6f/nolatix.pdfIn PDF document text
- http://pressvaluation.net/userfiles/file/87698389202.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081513d26101---kesajevutujebewuladizut.pdfIn PDF document text
- http://jingluo.net/uploadfiles/files/fupudanavesuvotob.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab9043a64---98874192909.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1456159db---fofit.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8373242a66---63091907254.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/53605610655.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/82e1784ce063de6247d06b8c756af21e/68327316503.pdfIn PDF document text
- http://rana-international.com/userfiles/files/xatomefizuwopunududito.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5fe38fc11---goxemuragusetululib.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/11963396413.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gr2dnga3q2sebnvcnilouktouh/1870933988.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_off0000f218.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF218	18160 bytes
SHA-256: `86a61e94b54e1c08ad3f008786faa634b8341862246a3eef4ece9cafaf6551c4`
`font_01_sfnt_off0001220c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1220C	10936 bytes
SHA-256: `c42eb78a6b8120adda393898b5a24039f22f347b0c4b28325affd09579ff803b`
`font_02_sfnt_off00013b43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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