Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a19497840098ad…

MALICIOUS

PDF

108.8 KB Created: 2021-07-05 03:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46d65fe165d555795e599c76d6d69c53 SHA-1: 50748c41221d6870dcd020638edc027ab65ddd23 SHA-256: c7a19497840098ad857233568f11ce3e7e203c85e8e718f500ac6db20f628bb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 5

  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071128c9c9a0---48137666981.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/46034037763.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6nged8t1638p2knq0ibrpgb6sm/83286343020.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98846f9c8---50451582741.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/781affdac99ece67c9e5c3c859098b69/femuwodobaxu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c000b8abf8d---tumefibibumax.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/pukopuzelelajozok.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/worutijanurugijigegasepi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a6823aaaf19ef75bdab84cbcf9a44160/67148355692.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c9b53ff329daf1ca242fc2cad8164546/3332764182.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2044948821.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/130879447460c99e137482b.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/duwudapibibakaxenevowu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/74382404079.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd284b0328---ravidip.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/6009864423.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ro8mmo1l1hobctfg9ali6i631k/lozidu.pdfIn PDF document text
    • http://tenfci.org/userfiles/file/2676354939.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xivewadejadamosix.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ec633b80b738b58bbb91b9b0f8d92a6c/jedinipalibokumimi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8d833557---32548115967.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pototop.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fb708ca7---68428991738.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6ef30e7d71966fa51891d9ce558544f/kenaxaguzopot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=doraemon+stand+by+me+2+fullPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57e56208135ec1a7a7f4b74cc2a8ebe/1534205643.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10900 bytes
SHA-256: 8b7ebf21d4ee0c9e706670b07dd55cd15a12395c6a6b5cf19206b7a0c6eb528a
font_01_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 16968 bytes
SHA-256: 4471fa6e2496c4dbf708fc15f82c3fddb264d85b0e04db4606ff94e093d8a12c
font_02_sfnt_off00013f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F80 23596 bytes
SHA-256: a22b36678e82794ccfb4c18099dcc21f483986e8f0e0e3ce6f70d34b7f205e29
font_03_sfnt_off000177c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C0 5872 bytes
SHA-256: c6983e097d9d358f53bc25a94a56a4215570dd2d99d332356fa8e62b7ab5842e
font_04_sfnt_off00018ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1