Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c20834e3405c3…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 00:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8ecc853b84c42df02f1b3636f15eec0 SHA-1: cf7f7956203838f32bf412072901239af160de71 SHA-256: c58c20834e3405c34753d0f7399b02c6ed96b47b8d32a6284317c9da04e4c358
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the presence of numerous external links on potentially compromised sites is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f8cded08---zulorekesopexuvi.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d5cde3fe2630656a9d787159cde1ed45/30770618827.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t8nfvli3m2mdvi6abmfv1g2h45/zoxavagudipidivojowumexu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c79006dd76d---59820917201.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0kotg795ne8nhmagso3bjofh0j/39554606026.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/xuseviz.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rugigofiziji.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f04fda09b---40658479416.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5aa8db38---mejili.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210608044920.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1g456s2ql8ru68l87p5fc9e0ic/6821022546.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zutukupigalosewoja.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/kazogodaduzebisetosul.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0s5tnu636b70jpnsepjl56vq00/negugadu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2888dbe2c9e3f0ae42d644dbc151d3a5/wegojaj.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fa2205d0b5176e255db8c832dba72e08/wamizalatelejazagabusune.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/pabob.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/29688650348.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/gepamipe.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/17244481757.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/27719318239.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086a19572626---34063275162.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef078cfec2---75416290225.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fozapuxulemavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+become+an+evangelistPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 17996 bytes
SHA-256: 59dff8f33f00d6c4230852fe45618ce29134b2d10f625b104eec391d9479b79f
font_01_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 11112 bytes
SHA-256: a97532f4b7f59953a0d30556c24dab15e1806cc7b3f5cc690819362e92463a79
font_02_sfnt_off00014044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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