PDF malware analysis — malicious · eec6a71d22671614

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 10:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4c981a20470aa65adfe866b7037f210d SHA-1: 01658a836fb15be56af1377c6e1bfec468475cd6 SHA-256: eec6a71d2267161449799a38f31b9055b30aa14a91a24e5d835f7e51a656ea41

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or hosted on disposable domains. The primary purpose seems to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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 http://archerelectricsupply.com/userfiles/file/28359111483.pdf In PDF document text
- https://jaurrieta.net/USERFILES_JAURRIETA/files/dogivupukipiwuwof.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kqgc7ni3a62nu58tle6cm9sbsd/41198651644.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nt2f2j90os69gfmtgfig1uffej/xoritasekoxozawaroji.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4de573324ec673e5ab4c9e4f7c34a4b2/58224384047.pdfIn PDF document text
- http://meuble-tunisie.com/userfiles/file/49474417483.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d4638ca8be84bfc16e8faf6778b513bc/45966632765.pdfIn PDF document text
- https://hoya.hr/UserFiles/file/38407358389.pdfIn PDF document text
- http://apexibd.com/uploads/fck_uploads/file/22743639736.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85dc022c16---xubatagixeduzaka.pdfIn PDF document text
- http://skisun.it/userfiles/files/wuzisofamixigu.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2cb4b164---59358875951.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f370b8fcafcc8da135f17a8b5b6ae441/16247759950.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dd6bcf87---buzufejudajovoki.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca19783dc---41217887751.pdfIn PDF document text
- https://photojet.bg/userfiles/file/sobebut.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a04630f077a61177c791ee37cc45dfd0/38874974973.pdfIn PDF document text
- http://expertsystemgroup.com/file_media/file_image/file/25566428058.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166644d958---26893318340.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b3e782ac---19735689308.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc302bda9---62453068243.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c52953d8e7a46ac877d0226a056d1777/83545988380.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03c519bc7---banubuj.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59e5743b7a---nipenugoxafobakak.pdfIn PDF document text
- http://stellarp.com/userfiles/files/zawikezeluxig.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d9b225f8242e6228ccba2a366105faf7/67562520520.pdfIn PDF document text
- https://chandrakantmusicacademy.org/ckfinder/userfiles/files/bemisoge.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=class+11th+physics+chapter+11+notesPDF 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_off0000fe2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11642	10668 bytes
SHA-256: `e9b58a669cc4dba950f761110f82997571919d9b807cd1ee5853ad3b8eb37f44`
`font_02_sfnt_off00012ebd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EBD	17376 bytes
SHA-256: `6770d3a83cebc14d0d33cc5ae32b7be07401f34de311f3298e0323494b1fc606`

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