Malicious PDF — malware analysis report

Static analysis result for SHA-256 97404b911121c50e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 11:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 198344e3fb5b0598ad9482c5f9be37c8 SHA-1: 445a7598f37be4d21d60aa82c79a145ba48caec3 SHA-256: 97404b911121c50e1675c8f12ed24da90f5dbb530c4be89a3b4d808805b6417d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://marwaservicecenter.com/nbloom/fckuploads/file/robusew.pdf In PDF document text
    • http://email-database.info/userfiles/file/53897067340.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614617031c833---82577068870.pdfIn PDF document text
    • http://skia22.ru/pic/file/roxepixejizal.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/98664938395.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nugavupamokenaporinironer.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c9b1ba7---bojafupogifol.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/federifogavo.pdfIn PDF document text
    • http://maihome.hu/admin1/file/73567823020.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fda19827eb---87695270137.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/015c9519f67d404006665168a397d155/17463192082.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/4067929257.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109200106344194.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/zepufezolusekazovela.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/dakezij.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/rexonoluxo.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/falemo.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/11408530254.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/telimekijukilul.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/57099155955.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/8381513171.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/kulubelulivijaboluxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=filmigo+video+makerPDF 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_off0000ad91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD91 10356 bytes
SHA-256: c73cd3122741ff45fbc63717ea05871c098173f37472dfceda68a5cf2146a430
font_01_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 16584 bytes
SHA-256: a675a8fec5e9ff1b2c2e27c0caacfc0ae869671819f441bca74b4f99b7119e3b
font_02_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1