PDF malware analysis — malicious · dce55650c1d17ef5

MALICIOUS

PDF

88.4 KB Created: 2021-07-23 02:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 45a7540b8ea4f2eba65e826f2009ea85 SHA-1: 870dcd7ab616d0b329d11030711be071bd2dafa1 SHA-256: dce55650c1d17ef5c1bda47b768bf15b56b4c9256a6e74e82d8e696273fd71a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and the nature of the embedded links indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://rieker-consulting.eu/files/file/veselikuxolepas.pdf In PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9613c1c975036eb1e0affaa2c6d5b1f2/64516486897.pdfIn PDF document text
- http://xz-brand.com/ckfinder/userfiles/files/9126334957.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3f51oaahcncmaggjed9imjk26/zuxogifiwidamuladesigoxi.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd620e74d35---vitasovatefikomapaba.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ec1a02eb---8658148688.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e336c0ac---zasilofowosonun.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b026e2b0e1e---mikere.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9fc8a58---32618977281.pdfIn PDF document text
- http://bradleyhillsapartments.com/demo/uploads/contents/file/sesibog.pdfIn PDF document text
- https://mimpishio1bet.com/contents//files/gegodudefen.pdfIn PDF document text
- http://alexanderkanevskyartgallery.com/clientMedia/file/70738482224.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/55c349190a463f371d7100a579bed8b4/86248685179.pdfIn PDF document text
- http://alimentosldm.com/userfiles/file/molinulexuzadu.pdfIn PDF document text
- https://fonixkoncert.hu/upload/file/4203666205.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/81ec74d489a4d313e6108a2a76bb7c36/83136219281.pdfIn PDF document text
- http://anhuizpyy.com/upload_fck/file/2021-5-16/20210516204932810774.pdfIn PDF document text
- http://slippersymposium.com/clients/875641/File/24797168190.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f61a5103f---pikagexokosukuwitunazira.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///70521741565.pdfIn PDF document text
- http://berbun.com/user_img/file/jonapaxozujifanunakoxe.pdfIn PDF document text
- https://linker.tw/files/20958669577.pdfIn PDF document text
- http://delvalle68.com/clients/54584/File/kurajeriropod.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0d0212eb---rituwutarasu.pdfIn PDF document text
- https://delphin-bau.com/ckfinder/upload/files/94589859676.pdfIn PDF document text
- http://dolphinegypt.net/userfiles/file/93230155705.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+mad+hatter+mysteryPDF 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_off0000f715.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF715	17308 bytes
SHA-256: `256eaecabec4249b71c0fa742682574f4a28854633000c9ba0d7c2dea29502a4`
`font_01_sfnt_off0001243f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1243F	10228 bytes
SHA-256: `b7bbc841019b61af7a56e3df0d6b424ba21efac70ca63929314dc6526b9af239`
`font_02_sfnt_off00013b3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B3F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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