Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d10937e0653e682…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 23:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dc05c778d7a0f9d7251299e002fe4f0 SHA-1: 88273b3a23cda3d05a811d34ad03e35ce504c960 SHA-256: 2d10937e0653e6822f1c8a048ae68e8def53dd028bea4eb1cae607ee6528178d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'MFA lure' heuristic indicates the document attempts to trick users into providing sensitive information, likely for credential harvesting or session token theft. Numerous URLs pointing to compromised CMS uploads and disposable hosting further support a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://bestpokeya.com/uploads/files/wajuxaminuvaborivafiv.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/88bb8a946cb1dda7fdc18cc8c66449f9/86838392549.pdfIn PDF document text
    • https://primer-spb.ru/files/files/21617999531.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93210095929.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/jimugojudutirewevemawe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/44e2c529da131e76002910b26e41d46f/56939457098.pdfIn PDF document text
    • https://ka-base.no/images_content/file/15556881374.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06d6a5fe7---robatopovavitexebosor.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/316266f385ded6e382753d9f8c15a58b/xekegogamirosisomox.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44e25151d---21968608786.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c99548ca9ec---96885631840.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161238df18f502---kejirakasivisikezigemareg.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f64dcb043dc9ef2028d3d654fef9408b/newuseferofuvidonuvaxaw.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/tuxitelu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7aef5f325---9587770552.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/98565900427.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/95300c98ba0b569f75f019cba9d2eaca/zikorinisor.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/74125991956.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/3285074745.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cf95554e---57907517295.pdfIn PDF document text
    • http://4bx.pl/public/file/25341652990.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/garozovevawa.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/31265711540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sjcam+m20+user+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b5e95d59df223120585290f340a4991a/nazib.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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 17844 bytes
SHA-256: 448908cbb4bde85bbfc353bfb86512da720d1d6c86472d7e880321b2418b84fd
font_02_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 10628 bytes
SHA-256: f081b42aea496b3a178913f870b12425dbcf6fba080a574dff3acc83399b35c7