Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18aefb7a94426f6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 09:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 485e502ce1f04e1e5183f4ae9d14adff SHA-1: 5f8007c08e8d12b436034c7127c87edb17661324 SHA-256: a18aefb7a94426f620ac6201652d7d2ddf4e8089ea50d543d99d920f20aa0906
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination.

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d1eaaf2db---lolopulutorasawonum.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090916043180.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/wakaw.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kilaroziruge.pdfIn PDF document text
    • http://aeternoplanning.com/ckfinder/userfiles/files/27768024495.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc24439fe---18464198693.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/jafiditig.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d45f56291---givabadegudame.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/12246909471.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/gupukujamisalefozasofu.pdfIn PDF document text
    • http://boq.internet-match.com/upload/files/bapotoxesobutivom.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/vipefoloxarejodep.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/8831020351.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/92441967535.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d216294---47265108250.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d8014a9c---97051463303.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/78533731064.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/lasugiriwedofurazuv.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/1484094464.pdfIn PDF document text
    • http://msiutilities.biz/documents/15565952717.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/kebavosugotebibeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=roll+number+21+space+mein+dhoom+dhadaka+full+moviePDF 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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 11400 bytes
SHA-256: e3d3d618ebecf1c102bce0cdb7358bb839a0629bdac8cab90d7c3a6e966b7952
font_01_sfnt_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16460 bytes
SHA-256: 4fd6188ce2536bc1fbab213d5f40e6082d3f04dc025aa90c34fdb59a9dc40cc0