Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35a42138577becb…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 13:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 573719ba8623ac7130253891848b0e04 SHA-1: 3f8cabd0710b5c2aa9162dc38640c50c20873360 SHA-256: f35a42138577becb4ff868a6fd4369df046fe625761609c3000dbdbbea5544f3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious files, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of these links and the overall structure indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160929dc960352---wojibudidivibakojo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wasufevowezowo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a93fc94---gixumugufogixogud.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02b59d2b8---woxag.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859f8d61b3e---51843764604.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/19d761df64b5f3b5ac269a1ec6789c41/koresaduv.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/15506245939.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vidaselipigasiz.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7a45acd4c8c11a023be2edd996d7178/fagita.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98426961960.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/salisozotagodavopevis.pdfIn PDF document text
    • http://webursitet.org/Files/file/5806042442.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6397n52nrcskihj2vs45c599p3/5399296468.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/89605561298.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6456f12b4---81866593910.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/dc8guapvpqa6d7tuu0lfhgvcg4/91674200820.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jeruwe.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/jizawusamatowoxunuboda.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0765736193fdd8de8ff516093d7d37ab/tesotetekenixigon.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d578e017---dalivugolotuv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e7d34f3f---xopeledunutunokobamide.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5493a555ce---81068069415.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219504ee50---nunovagexogujoviloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hive+insert+into+select+partitioned+tablePDF 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10704 bytes
SHA-256: 99b2afeea39d026bcb2583e570006f3acbaf9ce536e675b61336be4f63a0b08d
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 18264 bytes
SHA-256: 1f2502d8c63e9b8ffacd9e1d7b562d4dbef51d92940d582f0e7f0e30da2f0472

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