Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4394a8c77f3cea4…

MALICIOUS

PDF

92.5 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: 3e4a32b8360ac643db9c9ce0adf57971 SHA-1: a8a1e64757a8811e4511bf33f525c6393a93aec4 SHA-256: e4394a8c77f3cea491e6bb023d7db3b791af7f6b63b5d97c97575f9147243a2d
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malware or phishing lures through these compromised sites. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5910

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 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
  • 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://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 13520 bytes
SHA-256: 4c4c3fed69650e9c1ead457f16d5bbc05766f6f4b1ad512f6e12ddc6bd5b3831
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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