Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6e6f7f4d5e5237…

MALICIOUS

PDF

95.2 KB Created: 2021-07-28 00:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 85d0e5474ced0bfec472aafe0655e303 SHA-1: 7e27981ecb8d8c4244a2f2da46d74efdab152629 SHA-256: 3c6e6f7f4d5e5237e8fe71086bcea70cadd9211de120003335e4e4db3a60b0ac
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The presence of invoice or payment lure language, combined with a download button, reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://accessiblevehicleservices.com/userfiles/file/megeviwofuvafupapov.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e6ih46furb021hsb53d4pkfpp7/37122611590.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/ludowal.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/63070779314.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/55724624409.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/255fdd33dd081becfbaf9bce28060cb2/89691777285.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c549170330---vaxemutewilukosilobafepe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953652443cd---kilakubozawus.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783cd033150---lotig.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210725135940_66iv9l.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e5b0b3a94afab115dce5728b1c63b5f5/jimigupapeju.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/31447714578.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/bewuderaroje.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20dd7f4ed1a5b0eb7a52dd02674f24e4/71369466174.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/dazojugonixe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b13c676d7a3341ef665ac64b4b67ad6c/zatukabotibafakaf.pdfIn PDF document text
    • https://zzhqhi.com/d/files/tojegalodawira.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c03fc8c425db20b425dae4b4d5408af6/53035011774.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc77a577412---watalosuwi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6hq5vosenke5rat41gsc4qsrv3/66599189274.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nufutepoluwidemitin.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160be08afe8092---buronofenogivufisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+psychological+tests+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081242f09ae3---sojoveledatolubig.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_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10772 bytes
SHA-256: a6a35faabf70ef12c0ea1d3fa2edd234c8147afc3aa65a592afd862200d11e79
font_01_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 16948 bytes
SHA-256: f0baf9ffad7f7828b5938d14498782b8a75899a8f196fd8f03b4972088cd2b18