Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb12572bc087fa…

MALICIOUS

PDF

107.8 KB Created: 2021-08-07 02:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 761b7a6b6df6d367724a9640fd371f50 SHA-1: 5d517125c85efe4ea21d71c39e7b903fe6aa23d4 SHA-256: ecfb12572bc087fa26f6d660e17e93b30254887d2836990d742a589da0bbc56f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088043066f9a---vevedowajix.pdf In PDF document text
    • http://abwnickersonplaza.com/uploads/files/47028607861.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9oegtu0cbg2v01tm9vn5fa601/mixexeku.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef0d5c787---mimukenujedutixowobos.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/suxomigeluwufumaxekirit.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tewaguzuwawanozodojabutes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c791056b8ad---bozagupuvokiwi.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/45602777005.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/789a762851475e1dda2fa5e2d2c807b7/97083124862.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/31084557641.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/54952919238.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/zisibagututedabaxilego.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f91d38706---24349455016.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818d0d92644---59095513097.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c083ce98cb1---wojuriridixexifiwonetadiw.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/jikivemejozujit.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/97594878449.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/42849334864.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e1b0357c---31393436461.pdfIn PDF document text
    • https://renetravel.ro/images/files/50148269583.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/79767896921.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/55om54moqh2n2cahlijr9qnafh/63222015097.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/foxisixaxidapuwipanuwo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/28818045359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D9%85%D8%A7+%D9%87%D9%8A+%D8%A7%D9%84%D8%A7%D8%B3%D8%A8%D8%A7%D8%A8+%D8%A7%D9%84%D8%AA%D9%8A+%D8%AA%D9%87%D8%AF%D8%AF+%D8%A7%D9%84%D8%AB%D8%B1%D9%88%D8%A9+%D8%A7%D9%84%D8%B3%D9%85%D9%83%D9%8A%D8%A9PDF 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_005_off0001434f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1434F 33148 bytes
SHA-256: 69109b13fd46cd208d9ae2d6b2739157d45608ad8a8bc1e022168a4f2cb6177a
font_00_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 15708 bytes
SHA-256: 25ae50f589fe505897d5dcc9b28c23fcf85e0cd20740d164ab25dfe3380ab6de
font_03_sfnt_off00017d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3C 19684 bytes
SHA-256: 24dbf9206bdc4c66c7821479ea5efbc771f5fe0cbd3f7a469c579037d4f58c29

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