Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ec83b569937e5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 10:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 932e09a9da55d7d5f9bbaafa46019ead SHA-1: a8a92e33b489ba1da91b8c11a645eeeb54806dd1 SHA-256: ff7ec83b569937e5b4032ce29d134cfb2c03a811740ca1673c04426f7c0a3325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the links and the 'Pdf.Phishing.Trojan' detection indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dungculamdep.com/fckeditor_userfiles/file/gugogenewe.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41a18c22d---41380416044.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u0bb7hubmrqhdn5covn21psou0/xudunagegagigi.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/refotetasekakivuzabog.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c41697d05e0---bugodupos.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb5a5e911c---66791587156.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/7306120226.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1e8e84d1685e5244f125acd7931e48e6/tomugasipapipudoso.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/rozowubivip.pdfIn PDF document text
    • http://mosjob.ru/images/file/laxepatumeratusokerunimex.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m54vh9rv740drqmscq7dju7bm9106eef/tiguribumugenalozewoke.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/73755014995.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/297d31cda29b3c032f8ac49963ef23fa/kusomamaloxopojuvafi.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/64798455098.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mudawajoj.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/41356276747.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94a64853ef25101e30093ad5285bb907/24224266601.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/mudozefusox.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13240e90f4---65845372315.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/63501795325.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161169f5b86a2b---91366114776.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/30888115819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chemical+bonds+worksheet+high+schoolPDF 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_off0000c387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC387 16864 bytes
SHA-256: a704cfd8422869431af8bec523b4b7bc817244735787d3f84b1d016025828d47
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 11168 bytes
SHA-256: 9b4c57a76a4364279b7ee33eec72ce3227311f09df11d640c220c1005a020a1a

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