Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a45549c6824ef93…

MALICIOUS

PDF

81.0 KB Created: 2021-08-10 09:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c389ebbfceb295412c94eb85a603725 SHA-1: e12a49d7d6c36af9fb0d56045625ac4e9c31a808 SHA-256: 7a45549c6824ef9387fd9f3cff187dc3411a2c9948394764d49e3167b1a75f79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dedb308d7---lofilijiz.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1438b5e46983651b2842c52c4f0d9b7/giroduludogifedafudujoba.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb270869a---43859208491.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/tubudalewiwuvaxifi.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/61667603471.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30548cce1---linizigodozopapifawataja.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/woxewerozokodu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/beguso.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/38535931802.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202187184819.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf3275eb5---6589611564.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/3542845502.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/62804519211.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/gezezozosaxenum.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/57856253249.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/moxoliwawesogo.pdfIn PDF document text
    • https://t2sc.me/userfiles/44116558659.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/mexex.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/59407949766.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1983b960---58515673026.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/85988984039.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/52877106779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+libro+aurelio+baldor+aritmeticaPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 10848 bytes
SHA-256: 49fc4a5b554f703d946d39158041e737818b87566f24aacc369769fb8ec220e4
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18312 bytes
SHA-256: a84efa6c4991b74b4c6d758160af97daeae09d23006710c42b61ae9d36b922a1
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1