Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0938c0946a364d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 03:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe00874aef3dc1d9c9e3fffa2432a17d SHA-1: a0f8d7603d0bd6d275385df9a8fe5a4e32be2869 SHA-256: 4b0938c0946a364df24ef1a910d099e08e08bb73b9d6e02de2de2468e93a6081
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. The embedded JavaScript likely serves to initiate a malicious action or redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://holyfamilyhospitals.com/ckfinder/userfiles/files/16021402986.pdf In PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/tuwebemereb.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/wujekevonif.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/2297576445.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7e578afdbff187c92d45e0e02aa52c0e/xogaxuferufukagotolaputu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/78646190282.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/73669496328.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/kupanelovigik.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jogujitofupopit.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/70755566710.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/27952620268.pdfIn PDF document text
    • http://8njl.com/userfiles/files/94441404066.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/59912022669.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/guradidaxanesowine.pdfIn PDF document text
    • http://sns.hu/_user/file/93596374053.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14cb54d02ff826523f4174e373673b58/bosil.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced50bc1cd---69333178598.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090303550073499.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/97157938103.pdfIn PDF document text
    • http://fluorescent-training.com/file/manutim.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/valerugodizekax.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8bf5dee2---93795762512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tomb+raider+3+apkPDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 10504 bytes
SHA-256: 023095260e0981c81dc64cb5da29bc2b301050a6e08c4de6f67cf0842fc056c5
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 18588 bytes
SHA-256: 457b620b545095b4daa6e775a62edd9cd0b6e1719ee502084a7300bac9d664c7

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