PDF malware analysis — malicious · 251ee3103a9db1c5

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 04:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fe481eedf426723277c03274160641d1 SHA-1: e58f4c577cb79eaf59f4b6302bb9fb0dbf84640f SHA-256: 251ee3103a9db1c54552c2c080ef3f2f5dc6fdbf0c170e95af38c988bb08c0a4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF links and the use of compromised CMS uploads strongly suggest a tactic to obscure the true destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/pezetegesodemotudavopuzep.pdf In PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/583085ebe2edbab21bee3acf77a6a9d5/97801074987.pdfIn PDF document text
- http://allasclub.com/campannas/file/65748645111.pdfIn PDF document text
- http://haithuanphat.com/uploads/files/47207730648.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcc9792d4---33695602457.pdfIn PDF document text
- http://sowitech.vn/upload/files/rukif.pdfIn PDF document text
- http://mn-print.ru/ckfinder/userfiles/files/tixogorinuxufusebarebit.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f084f10c12f98cd20033fbfcc31dce/nutijukokukamivat.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zeragi.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f5f76c374a73f0a0d727e19e3043bd79/wesofetozasejas.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/fedebilaxi.pdfIn PDF document text
- https://mimpiindah2.com/contents//files/44769151836.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160826827cf80d---21066771130.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862dae9aa50---rabomemiteri.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7acedb807a---57075984615.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c7f385ec---guduxuvi.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d219f515c5766e625f76df747d6196de/76112755856.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/53784008098.pdfIn PDF document text
- https://promise-land.com/upload/file/60277582911.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/pozerafo.pdfIn PDF document text
- https://quimicasorocolor.com.ve/ckfinder/userfiles/files/66999536756.pdfIn PDF document text
- https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/55e5e7d81e28e6c182cb70783c07cff5/9671252620.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f355b4c5467859fcdb463ceda3ef8710/risubodo.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/dc1db90e4a6620065e218297bd3060c1/8705742901.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d3d84f0a3f1bc31d8234723f3430b659/36023556458.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+cognition+and+its+role+in+learningPDF 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_off0000ec7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC7E	10644 bytes
SHA-256: `6d4f4da3297cc295c0e5b47bf55dc7b5d60668a283c9f39ab732687fe4b70a78`
`font_01_sfnt_off000104c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CD9	17016 bytes
SHA-256: `b8d330a4b32b78c05c9eb6f6daebfef80da524dd917b2ca1611d678b669d27fc`

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