PDF malware analysis — malicious · 814df8c976d77127

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 23:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 7c56096d2d0485d6845a863c100a6b90 SHA-1: a44df09c5ea5fd3d6c0b929cb0f0602ff539b185 SHA-256: 814df8c976d77127c64e0d47ffd6aef70ec716dd90c984e86aa3673052a79b56

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it's a link farm on potentially compromised infrastructure. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://ketchas.ru/uplcv?utm_term=class+8+sst+history+chapter+4+question+answer PDF link annotation
- https://narimasu-chintai.net/jcfiles/file/fuzexekemiji.pdfIn PDF document text
- http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/vogefavivododadalasarupef.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3d30bf7703970bd3326fdfa653ddc5b/95575969490.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce16ae588c---1861609850.pdfIn PDF document text
- https://ipic.vn/userfiles/file/7868133490.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/32eedb63e38d5066d5c8fbc78bb1372d/xisekaluwixuxepama.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qo1c8e92h20hjlruqk2u90theg/80284387254.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3da48b7f8---zenudomozomukupikudivok.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/readgqh6326ti2ll7vkhlhpg2e/76209234868.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2l8af5qbfnrtse0ulcn39s5grn/noluwanisupebajeruju.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d9daaf3d---niwaziwamexeverava.pdfIn PDF document text
- http://renovfab-menuiserie.com/userfiles/file/wajubapejujetajug.pdfIn PDF document text
- https://nirmalujjwal.com/public/ckfinder/userfiles/files/vojalivez.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/nao7u565il6mib2b9tk0rgk4pg/nalixazewizalajok.pdfIn PDF document text
- http://woods-china.cn/ci2/userfiles/files/20210610235910.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/08b4de07b897e986e2a4b29ceeae1862/nifoxoj.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc4a49ecc---79546541433.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/sowopodibalekabikotiposi.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dba9a129b---5049436420.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d528510c697bf1e0d47bf10a396841a2/71652106116.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qs6ud99muecc7qk1ivqddruj3i/12094288159.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758501b3add---tajufedamatazow.pdfIn PDF document text
- http://grupophi.es/uploads/files/33197912549.pdfIn PDF document text
- https://fultoys.com/userfiles/16845832013.pdfIn PDF document text
- https://airtelco.com/data/users/_/email/files/dapofawifesasogata.pdfIn PDF document text
- http://s292376414.onlinehome.fr/datas/imgmail/file/vevalawof.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_off0000fd7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD7C	11232 bytes
SHA-256: `293420539db7311df751e84dd20e35f5d8de3a1dbaea56400dc4c5da7019fb75`
`font_01_sfnt_off000117f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117F0	17288 bytes
SHA-256: `7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52`
`font_02_sfnt_off00014536.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14536	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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