Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f1be8e53b6ab77…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 12:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f18babbdecf019c1176d11cfcc5ad54 SHA-1: b82fb08a2d186426f4cd7d6b8eb99600c784dbe0 SHA-256: 31f1be8e53b6ab77d1e81c4ae607fca48cfaae5c2a6209aee9ee8405761ca900
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. This technique is commonly used to distribute malware or conduct phishing campaigns by redirecting users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0163432ef5---dururukilazelaxesi.pdf In PDF document text
    • http://opusbiz.kr/data/editor/file/16217857056113d3eb2d0dc.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/98957810145.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/93758195008.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af49b58500a542bfcf47111a7da7764d/fifiluwidunonoxisuwunobop.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/49032922792.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d017594a---45377067209.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/60460126843.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/05095708909.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ag7jmirqvpudn2sohr9ca6ep63/vorupugi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5d7a93c3747fe02e6b6f05383cb19c3d/telalotigodobo.pdfIn PDF document text
    • https://agermag.ro/mm/file/56545303637.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/rotifunegusuze.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77d58ce42---64784382218.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735956eb178---fokovepalanovokifisuwer.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d93986bc99d---62603710919.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/vuzori.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/3929359840.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060153167142.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/volav.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb7b351a22---13181478040.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/10460880808.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/69038133629.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b333c2fe648ec6cde782d596a457bfda/fuvekatabobitorironajita.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/48302308906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bharat+mata+ki+aarti+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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10336 bytes
SHA-256: 549e02706ea532a7841af8b5a2939c384f31b2915014ae1231d070c66e528933
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16480 bytes
SHA-256: b0c0a6c86139759bcb7c2b7277664ebc9d1caf8fa78cab6ae8c2ea1997576a11
font_02_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.