Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b87d0643c3ad933…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 00:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79e7ff758aabe9818f5e86c77ae83519 SHA-1: a98a976e66b71d958f335b22bdff89a56db3dda0 SHA-256: 9b87d0643c3ad933369cb859bd9e2793a9b6f2e166ca0217575d4b5af4e27e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=party+movie+1984+online PDF link annotation
    • http://divorce-difficile.fr/userfiles/file/30266183542.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/sewelefujixeguzupojotunot.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/tofezijakuvonixemugo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/456378734.pdfIn PDF document text
    • https://lesura.net/userfiles/file/92566996738.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/nelowivotuxikajawozizof.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405441d4e1e---subenivogusijavogor.pdfIn PDF document text
    • https://labelmarket.pl/data/file/boruvuxiruki.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/suvixoraxere.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/98667149434.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zezojusodovimize.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/50972614785.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bilagarevabisokamo.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/silitasepabafunujewi.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dekigudewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/17969679425.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/75567729375.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ba868503d3d8e39480ea41ef3ceeb36c/63763451955.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/lotaxokipuwizuduwig.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/85283838174.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42484259328.pdfIn PDF document text
    • https://morabia.fi/images/file/jarawejunoxigisuxiso.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/8921620617.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/16503332368.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/sevave.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.

FilenameKindSourceSize
font_00_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10788 bytes
SHA-256: 9e054516485eb6884f8608a7c662dd1cfc13df956c6d23617a960df65e36a50f
font_02_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 17540 bytes
SHA-256: a6adc8ce4ebb1ab5933b2719117d0c16fe1419fb9b76245cd1be5b422f26333b

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