Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe084ef6c7674b…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e38f084665838e11a3472b1cbd6ca02b SHA-1: cab3cedb45352d3cf9b882d3a44f74a98c0880d5 SHA-256: 81fe084ef6c7674be96a9e20dbf1257d7a0e91a831a98dd2e8ee053eddf251ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcbde66fc---46171344086.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9046b5a63---58938097542.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609072e7b5518---24040227275.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d622c3e69---delelubeguwe.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b33b879315810c352c338187e9ccd07/14912849495.pdf
    • http://autosoftware.company/autoresponders_images/files/sesavudavojawulebemogafer.pdf
    • http://okuninka-biale.pl/userfiles/file/45584106882.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6b17084c9052ddedfcc9807ea03ed49b/41953479394.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5b01b1f0b0f97d7778d744bb4c34497a/75827379468.pdf
    • http://applecentervn.com/uploads/image/files/48146984834.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d68b51f6f---70486636401.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/gedowizugilonejusinifa.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1bc66b00162c22d116946596ebc963ff/14737847416.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948df54eff---12884438058.pdf
    • http://bhhangkhong.com/upload/images/files/godejogezeredamez.pdf
    • http://maxidmum.com/images/upload/fck/file/babezewidorotetiwakelasut.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a2sbtb4bkbs7mnjv7u64b7kmvu/69378515946.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c45e9435---44983127144.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987d0a2996---xubewewugilosero.pdf
    • https://whitesal.com/data/images/file/1141_20210610090629.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30aa0e1cd2---71414734405.pdf
    • http://qytbearing.com/upfile/file/57219851400.pdf
    • http://timandlor.com/userfiles/file/pibaredoretadi.pdf
    • https://emmaushuis.org/pages/79418259124.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/bujegirurusikavog.pdf
    • http://project-st.ru/userfiles/file/xekedufatoduposorugefope.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vlookup+excel+from+different+sheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facf.bin
ac88d931f39f5643c1545376639c1a9e1eac7aa0ecabf8d829ea856a1a4af35b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 17436 bytes
font_01_sfnt_off00012868.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16792 bytes
font_02_sfnt_off0001407f.bin
423c24cd66978d67f612116725cff233aa454c490a8b6e6f1e9643f6fd188fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1407F 10988 bytes