PDF malware analysis — malicious · 80e1f118e65adb83

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 21:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 98412cb0d0574ed25fe423345162f1e4 SHA-1: ff28e8caae51e76b2e7d2627c34d616c051b1f4a SHA-256: 80e1f118e65adb832e3e8892b1d0ad26b5e70fe502005f9fb2c640c0280d9dcc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=dagboek+app+android+gratis PDF link annotation
- http://logicparcel.net/uploadsEditorfile/730129612.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe12a1ac9---8283537613.pdfIn PDF document text
- https://chilegastronomia.cl/uploads/userfiles/files/83702008385.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50844637200.pdfIn PDF document text
- https://retrofitoman.com/ckfinder/userfiles/files/bijudupese.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5baf02f4---17520891975.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d5e88ce8---68187772887.pdfIn PDF document text
- http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fokev.pdfIn PDF document text
- http://mobilenmr.com/files/files/51211560586.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/64a262fd43ef304be988574801e9f001/58129449905.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbcf5dfe9---10745916568.pdfIn PDF document text
- http://premo.at/userfiles/file/76201065175.pdfIn PDF document text
- http://progettocecinacuore.it/writable/public/userfiles/file/sitonufifaru.pdfIn PDF document text
- http://antonellascarpittadesigner.it/userfiles/files/47386626645.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/xegabip.pdfIn PDF document text
- http://galantemontagnana.it/ckfinder/userfiles/files/kakesirinonemakudakep.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134834919024---rajuxevunirimiton.pdfIn PDF document text
- http://sperrincaravans.com/images/file/16762673241.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5aa5dc50a9b003a7037ad9ca531f38de/pizuviw.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/66818816489.pdfIn PDF document text
- https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kifaruvew.pdfIn PDF document text
- http://studiotecnicomartani.eu/userfiles/files/saxerudaxifagiwedejov.pdfIn PDF document text
- http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/lapugegukofozupiwodog.pdfIn PDF document text
- http://pfmconsulting.org/survey/userfiles/files/66554775484.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_off0000b545.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB545	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD5C	10756 bytes
SHA-256: `e82b5b6e1a0aec438d3ffe659fb5ada5710cae7bbf8be1c9bba3894abc76e46d`
`font_02_sfnt_off0000e5cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5CF	14944 bytes
SHA-256: `e6a7bfd62a957c5f4c7de90138f744cbfbb0df757122a191e09109b4aaee980b`

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