PDF malware analysis — malicious · e598deb7450c3471

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 00:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 81cf8e9af40de73690ec2c646efb2889 SHA-1: 223e4461b78c8ad41c5feb805ee1ddd8bf224ab3 SHA-256: e598deb7450c34713a2d56bf9d982d9213f8998f719dae2c637e2a113e70c53b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://synerhu.ru/uplcv?utm_term=best+manual+slr+film+camera PDF link annotation
- http://ducthoaudio.com/upload/files/rilofixuxufow.pdfIn PDF document text
- https://megatekspb.ru/sites/default/files/uploads/85225609660.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/gejexaval.pdfIn PDF document text
- http://clubselectionvoyages.net/images/file/pituturezatewamubetamo.pdfIn PDF document text
- https://przyklejki.pl/userfiles/35920527011.pdfIn PDF document text
- http://tuyothuyluc.vn/webroot/img/files/razaf.pdfIn PDF document text
- http://amadpich.com/userfiles/file/27089556947.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6700a7a90b21c9464595c02f6643652b/boseg.pdfIn PDF document text
- http://15881588.com/ckupload/files/vejejakaf.pdfIn PDF document text
- http://gildiamasterov.ru/userfiles/file/33145642142.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/vajibitenumamalukone.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2a8a9731d6ad38b2ec0a38c7d29c5697/89939142644.pdfIn PDF document text
- http://osteriailgalloelinnamorata.com/userfiles/files/76188572499.pdfIn PDF document text
- http://kidneytracker.com/ckfinder/userfiles/files/xizipimoliw.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ae6ad835---31873649166.pdfIn PDF document text
- http://0vote.com/ckfinder/files/34638931351.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcd2f19af---xovifilukufimadozipabis.pdfIn PDF document text
- http://italianopizzeria-pg.com/uploads/files/66185566411.pdfIn PDF document text
- http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/wirexupajuwejiku.pdfIn PDF document text
- http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/2706740021.pdfIn PDF document text
- https://tessuno.com/upload/files/6119326215e08.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v5p5j64e695qgji23co9ek7i20/27461252545.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8857768472f7a235cd5e37ca3e3a257c/xubijelepogasulox.pdfIn PDF document text
- http://igigeothermal.jp/userfiles/file/funeregegun.pdfIn PDF document text
- http://ranaghatpchsschool.org/userfiles/file/domop.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_off0000d20a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD20A	17452 bytes
SHA-256: `467298ef8a64975d942a43bee98aa1e7bc82c0da32b6901917721bb4b8a445e6`
`font_01_sfnt_off0000ff6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF6E	10528 bytes
SHA-256: `d67555e3a12373cddf19e9dac3b9cc3dbe73b1ee45f7b83ed890426bc9223520`
`font_02_sfnt_off00011766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11766	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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