Malicious PDF — malware analysis report

Static analysis result for SHA-256 576a00edc36c90f5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 12:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7412c6174643c899675e5c61324667d6 SHA-1: 105b3930205fd23b06853ee3c42bf6adea9be637 SHA-256: 576a00edc36c90f505ccecd52a1cffc3dda10be43b2cad1278ee5a10ee0f35ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e019d003397---bisagomugotonupavenexaj.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc952b2e1---duvuritewapugeg.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c46a3a36c---20397191285.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/norajeruximoruli.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c411d9a73e1---77039438257.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/89467495563.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4hkabjcb2572e4cfrcfm6v2hhk/gafufokusijube.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/87c7c02042febe736f91404fcd232b14/93842083219.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/45205bd3d8bf4eab9e46174c048cbef3/25210842043.pdfIn PDF document text
    • http://slsnn.ru/content/files/8901209215.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f1ee134af---25145298665.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/gasom.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8be51ed9f523e9a965d4655e355a4abb/51190429040.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/74208518703.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9d995a843f7131d0d6a5f1fe8cf8eb89/37073306893.pdfIn PDF document text
    • http://altinay-law.com/images/file/12021431850.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/96946940723.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/velofipagodoremulof.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nudasezodaneneb.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/63368948299.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wanusof.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/6864992169.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/28426269906.pdfIn PDF document text
    • https://amblamy.ee/upload/file/31596455822.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/76rnhjmmgm1khog21sv5690490/jezefopofoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kitchenaid+slicer+shredder+attachment+manualPDF 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 17908 bytes
SHA-256: 8603fc1125fdf21114283c66863de43bb2ab0f9e1af183bf4b9a033970ee2f7e
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 10608 bytes
SHA-256: 55cf2c5a8c66e9a09b0dceaab69b6d3900a0f60835b81fe567050e0c185d2753

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