Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f4dcf55c51261d…

MALICIOUS

PDF

92.2 KB Created: 2021-07-29 19:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe11856e8f4ff7af3063bc858f1305a2 SHA-1: 40639767833ec7505ad8a994f9f2cce6d37a7d29 SHA-256: 15f4dcf55c51261d6139c62de254406a7635dabe7825425c2eefcdae154e976b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=suzuki+grand+vitara+manual+free+download PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096535af3f58---vagobejunefirufogo.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/gisiruwiwupupigapipekanuk.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/06d9aa451166e6eeb7eb789a53dfa704/vijulojanekem.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852f63b995d---fogedefojemidemon.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/rovomagegununak.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f819ad103e---68209994516.pdfPDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/zidexaruzomufe.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609841e30779b---15188594828.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c7e674a---40907767046.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-20/20210620004307767164.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73288cadef---jipajawosuxipuba.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd607deef4---55391414592.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-20/20210620170037657753.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/risesowazanagumo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca36d9b33f---megetew.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/sopowuxu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/74406132730.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb51ee8b4---32816024438.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/86511920075.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/nutegetutinew.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/44f32d63c8bda3f62590c3be1f780b3e/95018686275.pdfIn PDF document text
    • http://wami.cc/data/files/23082723962.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5e9eedf39e1614cc919b0086cb512418/66893618175.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_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 11008 bytes
SHA-256: f0b43f67d2f8e34358db892c77e2f0e4482809a1828b421b7d6b6da9a701af45
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 20336 bytes
SHA-256: 34eb9a530d097538fde0ac276829137ac3b6139d0fa164f992fdff265278f865
font_02_sfnt_off00014a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1