PDF malware analysis — malicious · 962e36307c538ad5

MALICIOUS

PDF

78.8 KB Created: 2021-08-08 03:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 91b401209f20020627e4f4f3dd40882f SHA-1: 1a9b5acd3e4ac904df53b5e27a3529e8891bf49b SHA-256: 962e36307c538ad579cf65afcc9a993fcbe979683bcbb23f2475b459e9f0adb4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=libros+de+texto+resueltos PDF link annotation
- http://dotbamboo.com/file_media/file_image/file/71172245121.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad48cec4c---porokesuzoxofijononodot.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fafd03a0ca---48414590711.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/13ddf32edb34e24bac7bb8f533c809ee/piruzoziviwenew.pdfIn PDF document text
- http://thrifty-uy.com/files/others/63765177921.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa3240ff6---83584603858.pdfIn PDF document text
- http://pagyesa.org/userfiles/file/20210619184908.pdfIn PDF document text
- http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/82562413493.pdfIn PDF document text
- https://condominiovillage.com/userfiles/file/71673062860.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609818c6cc30c---zipekesove.pdfIn PDF document text
- http://strandedtattoo.net/file/75656914345.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/345a36ac0c9b0c78449a9ead70503e6c/39252830044.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c6j7g0tgpshlop2f5abo8c6bi6/giposezataverifewilukilev.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fffc52858---8215025552.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/88172442030.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/812d8dcee31beba8ec067b3e42ffef55/rozomujezusekapu.pdfIn PDF document text
- http://nktrading.qa/file/files/96447399568.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/02178842d7f8c3ec420c63ac035b6f46/tusuxolafeninexonozar.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/017ad674d2d46267a75bf858b34de692/92346918489.pdfIn PDF document text
- http://abwingsjanaf.com/uploads/files/juzuguribabubika.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3113be42ec---41493597321.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kajojekinilot.pdfIn PDF document text
- https://gerastar.com/userfiles/file/zesoxanajuxineb.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160707cda6fe4b---lilawakamukujo.pdfIn PDF document text
- http://vivaibonomo.it/userfiles/files/66503843495.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_off0000cf8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF8D	17824 bytes
SHA-256: `8343c20cfd043b39aeadf8dec6830642f989cc24fb8e94cfa831914a24a46b45`
`font_01_sfnt_off0000fd0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD0C	10276 bytes
SHA-256: `fcc3be9ff0b7b8b1e5883140b40768754150c14a4b9c453428b3b4771eb2ba0f`
`font_02_sfnt_off00011450.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11450	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.