Malicious PDF — malware analysis report

Static analysis result for SHA-256 912cd3b0743aab78…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 20:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84b4ec99b9205efb60ccfb1a2197dd14 SHA-1: 8a01987874dd7714f880fc610b9c5e60ab49f2d0 SHA-256: 912cd3b0743aab785a614a4248a91ba75130ebf9d4a68ccddc113f5c1c137e83
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://isisthailand.org/file_media/file_image/file/lepoxivelapodakag.pdf In PDF document text
    • http://centralcogtc.com/uploads/file/mogesetuvewu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161370e75454ba---tutipo.pdfIn PDF document text
    • https://jensbrode.de/files/file/nomimoxutepatuxikojifewa.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/96470613325.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/93767052931.pdfIn PDF document text
    • http://tchid.net/userfiles/file/dalewivo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mozedopus.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/17722652873.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/nisosubotonozamu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11392552724.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/18876097186.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/xipakulikuxavabutuxagu.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/62470504292.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e43cf6d668---gadizixivivevuguxefuz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9b72827586e8f6ab42487ae522b7f759/18547102919.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/71556729594.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a07835d105e59e5aee0c82a322bececd/72419006721.pdfIn PDF document text
    • http://erpos.sk/data/files/vizovaperujuvutujolikopeb.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/molono.pdfIn PDF document text
    • http://pronobile.com/catalog/file/gefulinekob.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/dibubivuxo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/wovul.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/pebof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+music+studioPDF 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_off0000b0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F8 16760 bytes
SHA-256: 59be047245c8aaaca8ac2b8bca2d90dabb7aff12fcce7e144538ab2a6b11f16c
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 10272 bytes
SHA-256: 59918a7a08ea7231fecd51a3ddf808af54feee0d37aa286cbe60c9e627a117fd
font_02_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1