Malicious PDF — malware analysis report

Static analysis result for SHA-256 8756101ae90bc83c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 14:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7157167a0ab8fe41379569f95dc77d83 SHA-1: 587b328e5dc64cd67d8e46d7f5010f5ac6124832 SHA-256: 8756101ae90bc83c8243cf3315c93fe356e844f22fa6179512c20109b0a973cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fedico.ca/upload/editor/file/dotozasugawejuwexefusirad.pdf In PDF document text
    • https://maturana.cl/upload/file/pozexazaxam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n4lhm7shbk6hbm755b5ae0kcr5/pafaretedijevuruviganodez.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40126550520.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/snf5f0sun24est0298vsigkii1/7894430549.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/naruxazazitukixot.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5enqnkdkeng19su7qaqposr9db/89291428839.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610a132565805---87751070558.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e2610ea0---6273472240.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/13dcc40538a0cd7ff751ee9b7471385a/jatamijufefonufawab.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/zovazolezirokisinezagib.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/tixutagurapebuno.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/89987080859.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210625091219.pdfIn PDF document text
    • https://andhimazhai.com/images/files/36147916.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/lopivakota.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911a024cb36---zonelazirumov.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/wagixamibipijarafamugav.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/42129395796.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fac570004---finabasukolad.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/se3nq34vd0682ottht29dhpbq0/15577528845.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/butataj.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a77b6462f92b1f661f36c7ec6d239bd5/foniwurexoxagixizapem.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3dd01dfd---94616248525.pdfIn PDF document text
    • http://gerocuki.hu/user/file/pefisinemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=partes+del+cuerpo+humano+en+espa%C3%B1ol+pdfPDF 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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 11100 bytes
SHA-256: 84fd7a7430e27cb7ad175ba1022683323d74bdc8d16b3866615b908ec25754a2
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 20952 bytes
SHA-256: 9b591b14b5b837dd4d1dd4636fabb2ece04cee64735d6e45eea9e34f316f05ac
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1