PDF malware analysis — malicious · 0231e3d2cc73f75e

MALICIOUS

PDF

89.0 KB Created: 2021-08-05 01:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d45b322dca11513e69cbb39b00c8b4f6 SHA-1: a0c9923935b01bf230ca91bc3b5a96bbb8dc20e8 SHA-256: 0231e3d2cc73f75e712eaeb5e2eefeaaf8aeb6a4172367004581c1f626d15c79

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://robert-zauer.cz/userfiles/file/vidopogazagojosubenonajed.pdf In PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/535fea57f45c5c1d1dd560e498d25047/duxivozanomam.pdfIn PDF document text
- http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19499114966.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6c7f4c3f883ae2335118bd15c38c411c/90903813316.pdfIn PDF document text
- https://vandolderskb.com/images/usr/tiwumonovefofer.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ad9441f459f1cc27d233c7411725cf7b/mibudikumaw.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5393a61d19753d68abd5413399c361af/zijolusedobozenepuged.pdfIn PDF document text
- http://sam-global.info/files/file/95973509506.pdfIn PDF document text
- http://studiofapas.it/userfiles/files/pijejabejudif.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/20abd297001f031bea047c088182e232/batetogubulokujuvikej.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/50734762055.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/63a5f8d44178b334318b9c48dfb7fb23/tokox.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/tufisunamonijoduga.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac64929e7---supapamidorel.pdfIn PDF document text
- https://viettrungson.com/media//Files/54022710593.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ib5ha9lks362spuklk1o3bglhf/82448218139.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d96c7b832---96801357284.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/dagopokuzubabodesonebe.pdfIn PDF document text
- http://buildinggodskingdom.com/webcms/file/pemisumofeporopapi.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bd41490cc2a730da7282643e25037691/66467859937.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7e4ab9870677af37e87438da3340752b/jenajurisonijizagexizeg.pdfIn PDF document text
- http://beastyenergy.com/userfiles/file/20495497798.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/elgdvk18ij9r8cuvvk7t0iv92b/konaneposadevujoled.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2ki5vvp2rgo8o698b9200v0b2f/balukutezevafaj.pdfIn PDF document text
- https://airshow-bg.com/file/93219208471.pdfIn PDF document text
- http://ridendo.cz/files/file/fijuju.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0dusq7kb2v4ataf3svip8thks6/libafezasudemepamibeb.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apprendre+le+russe+pdfPDF 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_off0000f46c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF46C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C83	10100 bytes
SHA-256: `bfb9998281cda10f5984cdcc32f8edee91df41512a6439cb85aa08a5e407ec1f`
`font_02_sfnt_off0001231f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1231F	20824 bytes
SHA-256: `c5ebe14a48c8f578d89e88a38e9df7a7181cd136500a9353060e7ee8742372f4`

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