Malicious PDF — malware analysis report

Static analysis result for SHA-256 d110a5d46dbadb42…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b822d9841c73ec1aa08f9d492ad6e69c SHA-1: 940cacab9db1c0e610275cd468fd6f6b5f680d73 SHA-256: d110a5d46dbadb422918a8f1467f36a39d44481f34ae421b3eaa62f858dcaef6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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 https://ratosatu.com/contents/files/zitupexawa.pdf In PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/59267803268.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/buvuxukaputetotefimozu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/dobuxazosuweranuzenod.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc8dba2a---zegezuxevawekazonasegax.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62432452362.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/43897211621.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mategum.pdfIn PDF document text
    • http://rc-modeller.se/images/file///14017983168.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde9235a90---1937621359.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/15080148138.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/84302941976.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/sasuvewisalapuf.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kexig.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/fibekurekegabefoka.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131264545d0a---30880018092.pdfIn PDF document text
    • http://www.pvvc.cz/files/65437799291.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3d8be63f893095197ba9af3f00a0670f/pilegawedawusizuxife.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/gowesiba.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fb7afa20982dc46e9aabcd28e2cebdd5/kofafejumifesej.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/67d0597a5ff68c5c141ab39f3684f558/31520867469.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/35649044557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ace+attorney+dual+destinies+android+free+downloadPDF 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_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 10752 bytes
SHA-256: 963cae89b6f0232678b3c101191dbd25b3ab7f85a7cf0fb08c32c8c0c758d66c
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 18332 bytes
SHA-256: 7762752780c4b9abe6f621117a72e9cd5032145a3f1e2f693e1500b20530ada9

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