Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1937ca4a8764d08…

MALICIOUS

PDF

204.8 KB Created: 2021-07-21 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8daa578cef4cb419c323251178b61c58 SHA-1: 34980a913453c0c075cdce9cffd6e536357a4acb SHA-256: f1937ca4a8764d08fc606456db40d2ae0b1eac8fdf5a5b83e7ac96bfa86bdde9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised CMS upload storage, suggesting it's part of a link farm used for phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pincailight.com/zk/UploadFile/file/2021060619584473499.pdf In PDF document text
    • http://blessingsngo.in/userfiles/files/gesijonogokuzuze.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/zaritejesed.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdcafc1f099baf2db2bb83c22ce51e13/55912485786.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/nunobepapiseveleroderalem.pdfIn PDF document text
    • http://digifast.cz/userfiles/dedudogaxabetewubokofo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c050ae43092---1756967542.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607168c7bed2d---jozulomamutibewatofepened.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d63582c0---76953001515.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wikoserufanoveduvede.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/81765748896.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/626e92cd53598fc2c97ef14d146f82f1/nenejawuxawa.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/308d3407b98f262378fd29265d84ec88/jolipojizimiwimosixegokok.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/46122642173.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/248d80073c5ccbe092b0fcde44c597dc/82869576351.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/segukaru.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/79959042712.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vodonuvesukikitemomovito.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/45672015929.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c364123b---wimadilegetugetezap.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f811e53ec---rezugob.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/el0uild8ohvn9lavatqtjphkb5/pozisa.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/rusesureduresa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/af674ce86cc95a7e6d3ee362db988d21/26278127918.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/jowumub.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/fibuvijibiwawolakobamoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+the+mood+of+a+poemPDF 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_off0002ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D253 23632 bytes
SHA-256: bd29a88462ef508385d54b2664e1b538f59b5a923d5ba8b3166373b72b5cca82
font_02_sfnt_off00030d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D79 10524 bytes
SHA-256: 907804da5506f4a64eb57eb5c087faf35d28d3b7ef05fe0685246657eb50a5ab