PDF malware analysis — malicious · e6f4dfd86a85fd7b

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 363d3577d4661923caeae53a6fc1eae9 SHA-1: eb496b02b18c5f642d5721dc92de8609e3ea5431 SHA-256: e6f4dfd86a85fd7b266bedd37a7c378d8ee47b8ad1ff8194172a0fa7de9ee87c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9914

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://nomylo.ru/uplcv?utm_term=top+grossing+movies+anime PDF link annotation
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60a2b2d87---kasojukazos.pdfIn PDF document text
- http://miroslaws.com/ckfinder/userfiles/files/xujifilujifupomapu.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fa43a51fc2d9cb88770dba866bcf47b5/99148638766.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/17244642309.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b615ccdd7cb5644b1e4b1f03e9fa2c8/zapegesumuzi.pdfIn PDF document text
- http://lt101shop.com/userfiles/files/sonur.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/24hlrf34qi8i7futdjhip9kj36/8940173609.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaca3b7250---fevaxarapegafuwitijapunek.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pgvgb3v30de3vdea7rd1p8v5n0/7077426571.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9b6d62988e97b83bfa0830d5bfa023a1/rikiruzez.pdfIn PDF document text
- http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/56819105153.pdfIn PDF document text
- http://dabaizhongxue.com/upload_fck/file/2021-5-14/20210514132226349319.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2536c78816---93167955219.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6d2e8e2c05c63c003058888af4c1cdb5/68656764440.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a851f6eda15---zujebibit.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6384ee7a---47242697136.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/53kct8u03it8i3rvibc1vvrn47/dabopunedifol.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9gg805nfopggu1g2947336agl2/43148520381.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2a8b3853---89337839902.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0592e23166---75777576712.pdfIn PDF document text
- http://xn--e42bt3l.net/upfile/files/lufutetexegepaxofumiroret.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6200b1565a820d7dfbd237501e5dea58/18690546667.pdfIn PDF document text
- https://avgdesign.com/userfiles/file/27828986854.pdfIn PDF document text
- https://www.assofmt.org/ckfinder/userfiles/files/73266549230.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a472c0027370fdb838acba0eff9dd121/vaxokutadulubaxagedotu.pdfIn PDF document text
- http://scheiden-maassluis.nl/uploads//file/jejutekomiwanoru.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_off0000c0d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0D5	10480 bytes
SHA-256: `62bf986ea09c6542a7c0e472d35dfeb75d963e93d63def1a04574337aa318a81`
`font_01_sfnt_off0000d8a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8A1	16472 bytes
SHA-256: `43d6943ffee5a7440c499c6f7dcf343b8b8e29732549ad263fbd07c781ffb353`
`font_02_sfnt_off0001031c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1031C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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