Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f697a5b716e38fe…

MALICIOUS

PDF

101.6 KB Created: 2021-07-19 14:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f35ebc05373c1df5401d03f13d919b3 SHA-1: 174c4df168a10141b5b0d6d1f8e0cd774f5612c9 SHA-256: 4f697a5b716e38fe5f1b6805dfd9583de15ff0e84c7148e998ef3e1ec961ddf0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9de1eadbb---novojavagivafozakipoworik.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bbaf73445d8e3e1acfc6676fe51238a1/poxunisamodepalog.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/67821125530.pdfIn PDF document text
    • http://www.puhito.hu/uploads/nokunulemefozerunijatupe.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7dpubcuihbd1m3b4jgj7fdrb6/laxanunedozobime.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3a628f99103dc00a10bee5ca93c31f7/jedob.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/matavaradifid.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/devareguvanabijan.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wisuzudap.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bowazoj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vrrqho0mag2r6h8jtpgi2v6eq3/zovubebom.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/tifowowodojaf.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cc2806615bd1430fe3b747074079c253/48298985823.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/44231592339.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/50161868333.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e04e3c2af---5202467389.pdfIn PDF document text
    • http://artospace.com/pics/file/6451148575.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484ed3a1e5---vulejamanujovezex.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8d146143---wekewuxefuxarut.pdfIn PDF document text
    • https://digireg.es/upload/vowurebijazari.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c2d652e7---puvawagad.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xuzidupiwimigifaf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ae48e901---48192234836.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///78650549127.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lefetuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+wuthering+heights+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015756.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15756 27180 bytes
SHA-256: 8f539b4a07d36d9321c6995c4d898d92f147f5aaa0b7a634f89fb11f85525c90
font_00_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 18844 bytes
SHA-256: fd39dca78b4d72c36275343b940265d8a5a9621df6bd6d7886a7da7b898afa57
font_01_sfnt_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E21 10964 bytes
SHA-256: bb8580bf3117ff1f89842d520e2e6bb8866895c8202545416dfbb074fe9fc714

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