Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0016b751a7aba0c…

MALICIOUS

PDF

90.1 KB Created: 2021-08-16 09:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a6c4d94cf0b933f3ff0c0a7eb24ceda SHA-1: 8efb261ca4b6c0a4c6244efe5b899a04e3705633 SHA-256: e0016b751a7aba0c4199d3db18571bc1b61f90ae5dc0b9e526fcfc392304bc41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristic firings indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, including compromised WordPress sites, suggests an attempt to obscure the final malicious destination and potentially distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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 http://robwalker.net/fckupload/file/sadetitezokevukeforan.pdf In PDF document text
    • http://kokalietudarbnica.lv/files/files/nanumedavumowupuzelepitu.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210808_024134.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5784cc51151372efbac1df5ff6368145/xojabukezodatarosawepugaj.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5bsourfumnu4v139lisqu73b65/fijuvegubilenisa.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/jupawilerunetumujurup.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6d1c9a750a50372806de6d8aa03bad88/61885220031.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b32dcc946---5902887175.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f9afeb77ccf---kidepovomuf.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jurijejojubebebemo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd8c8d610e4fdfc8d6657ae6055b2e9b/tazajebafiresidole.pdfIn PDF document text
    • http://aweibel.com/Photo/file/jezixaji.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab761ec78a1---88174082735.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210605105708114.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/94935895402.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/56477851221.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/kopelisidadali.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e2b148f4c8bc691804da56c08f6e85fd/musof.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/49445955267.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/43675273443.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14af6ce61ae942160e053d5949af6257/devibolagonemetuz.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22455493059.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kidixukupegaven.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2572fb1832---sarazolaxizoguwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maher+zain+mp3+download+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012c61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C61 24000 bytes
SHA-256: 3f916c274a9084a83540271cf6ed65a4053b4decc18a17d037f1be12c12d3ce5
font_00_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 11164 bytes
SHA-256: 059bb513070a0fefa253283064c6c071a9609948598dfa8f7fcf5075ad1e06b4
font_02_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16120 bytes
SHA-256: b99b14238d6c22fa7f45d041013ad4338b648c9c423df2eee2df1045e0054534

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