PDF malware analysis — malicious · ac51e6bd56b50012

MALICIOUS

PDF

101.3 KB Created: 2021-07-16 01:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 4d1d393c14c04a5ec22daf6425ebb420 SHA-1: 60abca01d52008fb17ef451c7fb57b5f707c88df SHA-256: ac51e6bd56b500127b3a2e91ae5631858d7eaf6e1cbd8a5de44e5d9c27222d47

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9708

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://irlanc.ru/uplcv?utm_term=strike+the+blood+capitulo+1 PDF link annotation
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077c92c4e497---duxefit.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/xixusilizepamil.pdfIn PDF document text
- http://kojeneckezbozi.eu/userfiles/file/92207988187.pdfIn PDF document text
- http://giaodantanthaison.com/Images_upload/files/kugijagazute.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160829f753ecc7---39405638805.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7872af936e4139bdcad62a9e81fee415/labimosoroxow.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/86825292914.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da404138f80---29955191916.pdfIn PDF document text
- http://biolabsrl.org/userfiles/files/73342692554.pdfIn PDF document text
- http://baugeraeteverleih.de/benutzerdateien/25942678841.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h28hkg2evmdcnooaotn81tluq9/zowakufukerirabibad.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gob2981c976i3foev2tgu05aj3/40261577013.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d4303165ba580c198e9551292d4c4f80/gewironode.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/a44lm10teh93t7btp5uk09uudd/vegoxopemewi.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072258980a9e---90161310034.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae4b55d98---68969524929.pdfIn PDF document text
- https://defrokatilai.lt/images/files/desopi.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7204528d0a3c806de6f3f6e0689563d4/5678201457.pdfIn PDF document text
- http://allycatering.com/userfiles/wiroje.pdfIn PDF document text
- https://isleo.com/i_photos/file/rumofimaneduzopo.pdfIn PDF document text
- http://webbuilders.com/files/file/12867608235.pdfIn PDF document text
- http://chouchoudauphongongtay.com/upload/ck/files/zekanulekekeliporeseta.pdfIn PDF document text
- https://sca-kc.net/scauserfiles/files/gunukadupidalijonog.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d925780af1d---dejosu.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd2e61263---52346846375.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/zorukijuruba.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF94	10800 bytes
SHA-256: `ecdde0f612772f7a2bcf828b2250099517eca541aea4613442a3ce9398c40cb8`
`font_01_sfnt_off0001085c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1085C	17796 bytes
SHA-256: `69c30433add74681a929295faedd579bf6cf6021b40a61e7b26351d23104a1e1`
`font_02_sfnt_off00013598.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13598	18652 bytes
SHA-256: `e776cc5105b70cd8c496ef13c28998098469ca6486eddd78b6af6832d247d84b`
`font_03_sfnt_off00016dc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16DC5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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