Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4f552e2617a52…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 03:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55c9c3fdf2f274fdad2b47eef7a59215 SHA-1: e861c0c8ec2c4818d7f905dd38fb164a66c7d0b1 SHA-256: c5d4f552e2617a52d697b427fb520a0f2e142ae27d0e9f2fefe0080ccba0e431
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting a link farm intended to distribute malicious content or phish for credentials. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd079cd5c42---64453686807.pdf In PDF document text
    • http://be-now.pl/userfiles/file/30497720883.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/47736776641.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/78538093866.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fowogotusizitigiduzur.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078080c57fe3---30414085395.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/xunuguleloj.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/97490476720.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/254a05171732722fd729175ceb3c50a7/golunuligut.pdfIn PDF document text
    • http://naoshima-habitant.com/bofapopitoxuwotiv.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd776ad3d2---wixenemeluzelop.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbf26edcc---2940665155.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/31357199185.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/mapebebu.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/barujuxutaje.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/serejiwagup.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/nukafijomupuwavu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773803258d2---jugobaxegulaz.pdfIn PDF document text
    • http://gibisch.biz/files/files/1632230566.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sinakomitejuwejebo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1c1c1cb0---67927418661.pdfIn PDF document text
    • http://dentistturkey.com/image/files/24920957187.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hdgbt5ptp4dj5f55fh7o0a0dar/48710570127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=victorian+poets+in+english+literaturePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/47409043310.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 18908 bytes
SHA-256: 5b3ade5e715fe5633ccf206d8f93a9680f4a96278185d2754c26e5d317cf3121
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 10720 bytes
SHA-256: 29a71d1f8129320376a983cb726115f9d55032639764b692668970c909d3757f

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