Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cc091f1f416989…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 13:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b989da157775dbc6e72d1096fc533de SHA-1: 3d7f184ee811879bfab592939d6934a35e56a2bc SHA-256: 67cc091f1f416989a7c68bfe837de58c4f544ed2045110a5a7d2b832c9bead99
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm or phishing lure. The presence of these links and the overall structure suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131893bf1a79---62077565123.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/10ac80635fa49d831965acd8f3860d01/79164905433.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32760994515.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210908_EC536419BF4EA880.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/88122304277.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mamelag.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/52492768862.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/75741536770.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/31698958216.pdfIn PDF document text
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/derunoxedududawupusiva.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/86472919534.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/felibipirexupa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/94457fd40cc90d31b9a9983944430784/77225779148.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/24770406659.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/63027852461.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xukapo.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090322004173.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/82352852332.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lavuduzurekas.pdfIn PDF document text
    • http://riph.pl/userfiles/file/84313328507.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/fexifaxusiz.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/bivomisup.pdfIn PDF document text
    • https://fptica.ru/images/file/weseg.pdfIn PDF document text
    • http://xyoaa.org/sites/default/files/files/73703213002.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161309311f3261---94390449725.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+close+tabs+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10580 bytes
SHA-256: e251847f29a2584b9d4e0b01335d25f848f7d14b98edba8054f001ad77e9c330
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 18324 bytes
SHA-256: 406dda030f2f5f34179e2c3a0b9623c5f3fcd82aaccf3b79ee6a8650f923df7c

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