Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c610c0ca4316cf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 03:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b4d964675eecee51278ed081c9f8167 SHA-1: 187a1ef49bf8794bbc59aeb7b35bdd1ed1cb8e81 SHA-256: 21c610c0ca4316cf62fcde05d77b2652608472776e03c670c93c595f8fe4b463
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These URLs likely serve as a link farm to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://smidgel.ru/uplcv?utm_term=kidnapped+robert+louis+stevenson+pdf+espa%C3%B1ol PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cae3b9e0---tomapajusi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jitosatabela.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/zomixujunugibuxor.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b8a3b1d---95478764741.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/vefinowufiruridemu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38995389713.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6072b4a71bb44b6faae5730007ea1527/batapepuzojexusokogi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f259e984c0---vogowubepaxupudotuboda.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0ccfdf255f30a97b8503de7daeac4257/dojogumadibexe.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/vobezikivemixo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/18475996498.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc41803a53---konawopolezorijaguvax.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/togulosokanotupoj.pdfIn PDF document text
    • http://artospace.com/pics/file/35864010785.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sazatesaxupixupasup.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210804164314.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/tewikexewefiveralo.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/32504196238.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/66897979325.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/nefobob.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/lamapubafe.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/godojenofozemisanud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 20356 bytes
SHA-256: aaef4fb95a6bd6a61493315675b282854a5421079e1c70530863feb0d6e9a260
font_03_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 10992 bytes
SHA-256: d1bdaf9df55f47a27e0d9f4519c1f1994611478a6d3a13e3a1ea77b6231f5bf3

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