PDF malware analysis — malicious · 1bd95b8cfc3863fb

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 19:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25

MD5: c08b33baaf62b52fce07a9aed28d3170 SHA-1: cdc2cc2734a08c47fb1a2f6244dfb5f677ab5c41 SHA-256: 1bd95b8cfc3863fb9a6a320e3a11c8fbf4105dfbb7d45405fa4556054818c1fe

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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://cructi.ru/uplcv?utm_term=to+mp4+converter+free PDF link annotation
- https://szekszardportal.hu/userfiles/file/kuledofezinadawogurinur.pdfIn PDF document text
- http://wiskind.com/filespath/files/20210907155222.pdfIn PDF document text
- https://jmtours.co/aym_image/files/nosivekotusajameke.pdfIn PDF document text
- https://maria-galland.ru/files/file/4746567401.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/kuvirokovuvixopegude.pdfIn PDF document text
- https://alutat.com/data/file/42232862102.pdfIn PDF document text
- http://www.vikingmaterials.com/img/tozelirarodixerowuzoxa.pdfIn PDF document text
- https://beautyyaurient.com/editor_upload/file/57356571214.pdfIn PDF document text
- http://timnhanhonline.net/upload/files/watoxikomukil.pdfIn PDF document text
- http://vinhomeshaiphong.net/app/webroot/img/files/96364414996.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c260525---73998468366.pdfIn PDF document text
- https://ambient-interier.cz/files/files/57050326237.pdfIn PDF document text
- https://md-bud.pl/szklo/photos/file/99709709537.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/5352525764.pdfIn PDF document text
- http://devison-matras.com/upload/file/88526692076.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e049e6e3e2---wogirafurawapo.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc2290ce79adc82eb1d8bc9d5ead75ff/pakuseru.pdfIn PDF document text
- http://myappartement.de/web/editor/files/nolofiwitu.pdfIn PDF document text
- http://goraku-sangyo.com/userfiles/file/25134101886.pdfIn PDF document text
- http://propack-th.com/image/upload/File/wumanilifibebuxewiwaxuw.pdfIn PDF document text
- http://rapet.hu/files/7704992075.pdfIn PDF document text
- https://faresaldabbous.com/uploads/files/48331135608.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fs7fhn5vjho7ihh62ism0uuidf/kurojekejosol.pdfIn PDF document text
- http://celesteandtorsten.wedding/images/file/73706586436.pdfIn PDF document text
- http://akademia-jedenastka.pl/zdjecia/fck/file/23258098167.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c3e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3E0	16160 bytes
SHA-256: `fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4`
`font_01_sfnt_off0000d97c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD97C	10280 bytes
SHA-256: `29bcc3db5efff8a043069bd7577d9dba076271bbab8928d9a502eaa328696f1b`
`font_02_sfnt_off0000f0a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000108b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B2	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_04_sfnt_off000110aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110AA	20416 bytes
SHA-256: `281e30219ad8cfba639fae0d5b2fd0255400b0195d72c9d3369a7d14e46dd423`

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