PDF malware analysis — malicious · bd85e40d033434c4

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 20:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5d44171975b665c334bb2a5c71dd8858 SHA-1: 738bd43dcd53577456d25c765645e720ec5c170f SHA-256: bd85e40d033434c44fe25456e69a49407e81034130d70050be8399ea541e5479

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which are WordPress sites using vulnerable plugins like 'super-forms' or 'formcraft'. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links and potentially further exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://catamma.ru/uplcv?utm_term=cer+claim+evidence+reasoning PDF link annotation
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/954a19e234d92073fbef4cdc8ac1d765/74350994798.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2cf7397cb099cf1302b888e390620be5/57723694290.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5i4gkfguota9amf32rgfficcv5/lidopato.pdfIn PDF document text
- https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/paragetimum.pdfIn PDF document text
- https://muahohangnhat.com/app/webroot/uploads/files/10308843512.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a372009c27c54b4c7fd347cd29eda07d/82912799635.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5bd697c49---40043815806.pdfIn PDF document text
- https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/daronalanironopamik.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o6mejlun122fmrabfstptttc27/55477930453.pdfIn PDF document text
- https://carsen.sk/editor_uploads/system/files/4483596570.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609117dd246bb---negomibogepolisebe.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f7b011d3---nibanukifurifireg.pdfIn PDF document text
- http://interwork.sk/userfiles/file/dudalalibedok.pdfIn PDF document text
- https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/64514280350.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6a361b4a---tajor.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607264101cf72---lululene.pdfIn PDF document text
- http://cambridgekapurthala.com/damana/userfiles/file/90596824851.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbda456295e63b90e3f6baaf3101c01d/81212159825.pdfIn PDF document text
- http://chi-kara.net/userfiles/file/jerikega.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/db85119d70c27cda0404bef32a83d09c/10741903925.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b455cda0107---zejefufugelifi.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ad027b66---39212155952.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a3cc91b29dbb1564e4141d24e4f25b41/30329048676.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ba78ee3b12fb0d0876343755aa7fd05/57968237882.pdfIn PDF document text
- http://i-daa-wl.de/userfiles/tatizupasuxapowibagulitu.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fddb06702---zewinipivoto.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e6a1a102c---lumijogataxon.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_off000102a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A0	10712 bytes
SHA-256: `6828ac38ccf95493907f72c04339d6856ea24658068d7f048361a6c6d97ae180`
`font_01_sfnt_off00011afa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AFA	16688 bytes
SHA-256: `de4ca7976bbf23ebd1b1ca843afe7770489ce404234775fefccf7cbeedad5b3a`
`font_02_sfnt_off00014625.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14625	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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