PDF malware analysis — malicious · 6a538509dad5748b

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 19:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: a83ce314c65b07f566def2c684b2fac5 SHA-1: efe8a25b4a8caabc26bb7b34a78f1963544377ab SHA-256: 6a538509dad5748b0188138365863948d265eadadcd7a7d7392c6cf9bdf8cc2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories. These directories host further PDF files, suggesting a multi-stage attack or a distribution network for phishing or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7e55624f43e326b45f852af0d35e4ff9/votorifadu.pdf In PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843ae2cbe09---kogad.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7b29d6f4---govirovegexutazunib.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab558d604---23682844435.pdfIn PDF document text
- http://fatamorgana.fr/uploads/assets/file/witovokinub.pdfIn PDF document text
- http://ngnjl.com/userfiles/files/36124004093.pdfIn PDF document text
- http://gvs-russia.ru/admin/ckfinder/userfiles/files/3808080161.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/91287333927.pdfIn PDF document text
- https://j-kowalewski.pl/uploads/userfiles/files/veluzetug.pdfIn PDF document text
- http://krajinar.cz/soubory/files/67624748435.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/85ae686ab7b5ee21658ee42a899444ee/91879280084.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d44cec7---jifegebulire.pdfIn PDF document text
- http://storemisr.com/uploads/files/jabupikixalexaza.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a4vrlslieg4qe23lmvvhv9r9qg/kufazamuri.pdfIn PDF document text
- http://cungcapluonech.com/upload/files/xaribofudarudubilew.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/aa8f6c798ffc898a1d2bf47107ee5e6c/pezimusonijikinuxeretab.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cc9cbd7---91646676822.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cfb4145b---8882039581.pdfIn PDF document text
- http://cpghollywood.com/userfiles/files/tazonakonipabutogizu.pdfIn PDF document text
- http://wsp.pl/userfiles/file/77758764513.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/170776101714647afb23510f3189a644/8845762025.pdfIn PDF document text
- http://capmar.eu/userfiles/file/pepobikedovaneza.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c4413262a---76066264361.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t43ell3k8cismdvttf3ac4b9t7/32985860498.pdfIn PDF document text
- https://fasaac.org/temp//files/88830910893.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13362ca4cb---61638308935.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/83b1928e5f16460ce3c7e57d7b3f35f0/16955502460.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tom+and+jerry+movie+starsPDF link annotation
- 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_off0000f716.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF716	17576 bytes
SHA-256: `27b07b83005c5e32f8e45c2651f0605222a1567fc21d4072bdfeea4b3f27260c`
`font_01_sfnt_off000124fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D14	10636 bytes
SHA-256: `a259aa9fe9b1572abec77fc267b2e2bf6df43c9134ea158fb375a62125ee1472`

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