PDF malware analysis — malicious · 6c2cc45eb7c5fc0b

MALICIOUS

PDF

92.0 KB Created: 2021-08-22 00:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8df1d3456b659e17db47ebad1307cde6 SHA-1: eb072b8b198e724db864431efe83484dd832f992 SHA-256: 6c2cc45eb7c5fc0b8f1a89fc531a11e6421fb40bf6954faa8aaf45a9ed03a96e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malware or facilitate phishing. The presence of URLs like 'https://synerhu.ru/uplcv?utm_term=el+libro+verde+de+la+bruja+solitaria+pdf+descargar+gratis' indicates a lure to download potentially malicious content disguised as a book.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=el+libro+verde+de+la+bruja+solitaria+pdf+descargar+gratis PDF link annotation
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/871690f047713380c6b0491715569c7c/68065054327.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723547c64e7---61956297593.pdfIn PDF document text
- http://zcapitalcrm.com/app/webroot/uploads/files/fukeveralemit.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccdaed77fe---98708013927.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608629c42b0a2---xumazalepufujatovin.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc9f5bf93---5578625508.pdfIn PDF document text
- http://askaudit.ru/price/rativevivifaxubolalamo.pdfIn PDF document text
- http://print-printonline.com/ckfinder/userfiles/files/vedore.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073285bde000---55606555847.pdfIn PDF document text
- https://icbacademy.com/upload/files/dekit.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078601dd73b7---zoxovajopun.pdfIn PDF document text
- http://mebelhotel.ru/userfiles/files/6854243326.pdfIn PDF document text
- https://doublehaircenter.com/upload/ckfinder/files/zadigaxek.pdfIn PDF document text
- http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/sinavetagija.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/90cnhrvpkcm9n7vhooinrsul34/vafigavokobuviniwifuxop.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450ee100d2---17954832362.pdfIn PDF document text
- http://yjsyrj.com/userfiles/file/mogiweluzobajerofupib.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/kifamedida.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/v6de5fta0atmn2t11ta815k7bg/supinakufinirapax.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45391d05a3---segapejesigezirez.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5dfc8053---juvesap.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/93b7b92e30030930cddede7115826dbd/42825829685.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fdbaf0997cdb0ade0d9018ed156af2fb/96722529664.pdfIn PDF document text
- https://venefoil.com/ckfinder/userfiles/files/sukadobofedigitevukuli.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_off000102ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011b05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B05	11112 bytes
SHA-256: `2f897baa0333d57143f8c8aee44d7c246783c810c91a363bc193677e1d49a79d`
`font_02_sfnt_off0001349f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1349F	17288 bytes
SHA-256: `e767f8733878b57a63138910f3ef4e96c4390ab80d5e73b183f831fc3dd09cca`

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