Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dfe1b6f106df51…

MALICIOUS

PDF

82.2 KB Created: 2021-08-08 01:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55ea06f8076ececc6294f9615910fb9a SHA-1: fa09cea14a4f3d866189d45cc8c4d9a6a37b4312 SHA-256: a3dfe1b6f106df51922790f8779cde0c401d95c6ff721a6aca802410a51f9b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://quaint-house.com/images/blog//file/41742860924.pdf In PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/timixubowilizumipedu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/popig.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/vaduvorotulixixomudufowu.pdfIn PDF document text
    • http://fitviewer.de/files/file/xonugularawibupur.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/xokibanakevira.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/4215088475.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/288727694.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/55796219079.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501204722180.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/tuwozu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/kedimijilamebolurosenit.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/57587966811.pdfIn PDF document text
    • https://yellowstonewildlife.com/53957907918.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/68802654796.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f062aa6b7f87763ed2c6d6d776e5961f/feleve.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ad3f7ebdb5bdd77d707a716e98814fef/31062917598.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/85015766041.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae8785a0b---21487719013.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gv1inphltrmf1jg7gq1tfkj3o2/kasemomirurugarubasib.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609e177b3cf63---musemokodu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/piwewepurafago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+descoberta+do+primeiro+amor+elencoPDF 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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 10796 bytes
SHA-256: 78204cc1e37cf3d5471ac8dc4141aa62893aec51ad5ea1e84bf727331756a515
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 19744 bytes
SHA-256: d1cd4586248fb609533d360af8af3dd0f859a858bcf3353173f38e1d5bf499d4
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1