PDF malware analysis — malicious · 21b0090901425d46

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 22:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 34626ba0e44c4e7718d19f6712b7830f SHA-1: 3fc9ce0a083a644fff7c80073c77de863aa7b9fb SHA-256: 21b0090901425d464dd4b2d2c148323e5110c6b68e5d34eff21602b9fd3590b4

176 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 0.9929

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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://coretry.ru/uplcv?utm_term=a+good+thought+for+a+best+friend PDF link annotation
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5775aea964383de505a0ae07dd6f8910/metinelevigowolovibipij.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1cce401cb1f09ddef9daeb7df0ba5077/terer.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ffff0b9fe7e0635cc8210759a002d8f7/fidewimufikaze.pdfIn PDF document text
- https://etcbt.com/userfiles/file/4877850160.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/walajularirax.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uicoiqohe48dqtfpgl63cke5d4/50919458598.pdfIn PDF document text
- http://surtek.biz/image/files/20150129_182009.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b195bc75bfd---wuvidiberejopuj.pdfIn PDF document text
- http://chixue.com/uploadfile/file/20210524013411.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/j0svagqtmtvir55g5rj6ovi882/6095219091.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/rajupedewulawoxad.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a9f6c1ccabc84b7b870341ae835b2720/62090915171.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/80a68976ae8f164e515fb76f267fd485/18470211921.pdfIn PDF document text
- http://kapalishakti.com/ckfinder/userfiles/files/61081983254.pdfIn PDF document text
- http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e4c31c9cf---26626146896.pdfPDF link annotation
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce928de266---nulitagadetotoxike.pdfIn PDF document text
- http://skolicka.eu/foto/images/file/8686417811.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vvqfm6r8nmjqgrhaf2o8ufpmcs/kosawalix.pdfIn PDF document text
- http://longarmquiltacademy.net/fckeditor/userfiles/file/vavugirisemarodatizuwidub.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845284674aa---xabasututekibe.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dfd4f3d8ba7240be4be810c42e73664c/mexekawamepano.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff9b909aff4c9e9c355680555ddc37fb/73015466584.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073736dbe7db---rasuxinudagojanoferarebi.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e89cb4c5d---5541123106.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/735fd956317942fcfb38303dce8f2138/pixuranopajatup.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_off00010b80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B80	10808 bytes
SHA-256: `807a75c309b5be5065007123fb4550a82c11204d590d64a3c70eda074786de42`
`font_01_sfnt_off0001242c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242C	16884 bytes
SHA-256: `09d33fec54cef47a040a320d85b98574152fb0a83f368febf503a29e4d83fd12`
`font_02_sfnt_off00014fdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14FDF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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