Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f08ac7b94dc15…

MALICIOUS

PDF

116.2 KB Created: 2021-07-20 20:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa6d6d2340a80fe82ba34efc351b9d8 SHA-1: 10a492155a854b9163efb10bd6ad9f4e944c4188 SHA-256: c25f08ac7b94dc15b229e575c5d83fb8ba613e17b1fa3c34bfabf0b8d318cda9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6bd28ccf---xesobazawevuxowejo.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otpcljiuslphva2v13qf6lk4v6/44860052969.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/lajisusumosos.pdfIn PDF document text
    • http://builderall.info/userfiles/file/59042972289.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80453060858.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf057854cef---jisevanoxatuvoludujemogo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609448ea88e76---ruguxijineb.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/ditilubomegexamijujejid.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/fobokasomekojikebinoro.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/busalazejikotagigebedof.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/37353484027.pdfIn PDF document text
    • http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/3790511895.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9k8cj1rafcii82uq0sblbi9nuv/rubulumugul.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/95062040220.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61811d539b---67461655168.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a3ffad55e522f9860db1c7966146898c/7082847635.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3c81cce3dca09ab4beece121270d73f6/96034742063.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c14e7aa0e---bobugijas.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/13107277706.pdfIn PDF document text
    • http://chongros.com/userData/board/file/32274619396.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e36631f087b---21482256720.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/35778360137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oxford+new+science+in+everyday+life+class+7+pdfPDF 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_off0001626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A81 10960 bytes
SHA-256: 34847ebe252ea2b3201cab8496672b1bae2dc9128e6d51a52e406758d294f27d
font_02_sfnt_off00019430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19430 17940 bytes
SHA-256: 5378b33ec9470f29bb233fc5cf9e612a3f2d3581c6296d1729d3e526800b00dc

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