PDF malware analysis — malicious · 5b3e1d34c0a324d0

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 05:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 378680b403752169e20e91c26898f9d7 SHA-1: 92b5c1911ea40cb0f1a3feec0cb23cdefebba699 SHA-256: 5b3e1d34c0a324d0a4d43638c8e82cf957cca5f8b5a19dba6ec6d0cb267c2d38

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious external URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8fc903d8cf85ad8604a9f2ca1e3dea7b/nuxatotulobimenolozur.pdf In PDF document text
- http://pospatrans.cz/UserFiles/File/josom.pdfIn PDF document text
- https://alnahamgroup.com/userfiles/file/nurok.pdfIn PDF document text
- http://kidsjeodo.com/images/files/32875149630.pdfIn PDF document text
- http://digitalpolicycouncil.com/imagenes/file/80399055406.pdfIn PDF document text
- http://etasystem.net/userfiles/files/pusorigobukiroresi.pdfIn PDF document text
- http://kochamsushi.pl/UserFiles/file/safigumutudadufuwepas.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e946a340---41906180978.pdfIn PDF document text
- https://exxontel.com/file/fesezoforasag.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oj9c7lsdqc4b1ct3bushspugd6/todanebageximiru.pdfIn PDF document text
- http://salt17.com/userfiles/files/40622179050.pdfIn PDF document text
- http://szalkasszorutacskok.hu/app/webroot/files/content/files/51621614530.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/tezapopikupi.pdfIn PDF document text
- http://guojingmall.com/userfiles/file///runajetolubesot.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/954eef70b470aca5827c0a4bd4ffb038/46332255198.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/45412564b729ab3dc63ebba5157e57e1/logobarisivokupimuk.pdfIn PDF document text
- https://cncunse.com/d/files/34511947177.pdfIn PDF document text
- http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072541958698---bakikowabapiferonegegogun.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/vimebetemow.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb50918c8---5765233466.pdfIn PDF document text
- https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/6e461d638563c2d3c694baaa9ab63c95/92956017785.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a271360e510---87383298043.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/786a0a4f284647ca9b9d291c905fcede/ramawisezofasireze.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/97181877731.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=full+black+tattoo+cover+upPDF 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_off0000e9a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101B4	17664 bytes
SHA-256: `89ce10dbb2b5dd1fbf5045544a998a3f7812ac6a0b225af039de737cf10df3d7`
`font_02_sfnt_off00012f5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F5A	10376 bytes
SHA-256: `a2d72f07c948ef09fcedc03be5962fb09c2a0b52627d6872fa3d9f8a8b6c74cc`

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