Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dc2cbbfcdb814e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 09:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 59e7652f05f838975909f62eec74b13f SHA-1: c2aba6d76b9d28244153d3b61cb21d780286ed6f SHA-256: b4dc2cbbfcdb814ee179b024e16dd35b8607f17bccc245c851582eadd775272a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The document contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://archism.ru/uplcv?utm_term=missing+my+baby+in+spanish PDF link annotation
    • http://shiokuda1.com/contents//files/diluzolubawavobededijojox.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e9f5e58fc---tefasuvesulixu.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062612043370554.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d9e492d365b0aa16397873641d320e30/wadamawedofozuduvofedaraz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef593606c---punazop.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zonunigewigojazabodumeg.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/50285680552.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/59162383134.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/45466123140.pdfIn PDF document text
    • https://kede.org/userfiles/file/45111122995.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/64992426242.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b064f06f6---retinawapazezuge.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sepaxubilijezox.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0bd9116e---wesofuloji.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a62af72203a---rawasujopovixebor.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856564a19ae---86075570541.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a595790a304c47a635c00d5328351553/fuzederu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/43155545796.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9c6eb976---15718305805.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xabirupotowev.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3paehb6dknat80spavqq91ivr1/duguradakosugox.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868657314a2---83200507151.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec4aff7d---puseriso.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/95763566577.pdfIn PDF document text
    • https://shopabrang.com/images/files/kitikavu.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043001525686.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10448 bytes
SHA-256: 3dd78e54b12406210500cb82d8f81599e420ad6227962fd55a40fd1329ec007a
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 18080 bytes
SHA-256: 4a859c35adcf75cc6750c2b69e4239634d35b067ce9c7e2a0b24426ea6e81774

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