Malicious PDF — malware analysis report

Static analysis result for SHA-256 9326a2164567383b…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c18e86f5ffbece9a29e47096abae12bb SHA-1: f243eaf5cec1786c8782968ebbb1ced9264ae695 SHA-256: 9326a2164567383bfcd3901ca6ae1847e60272b18feb2221ebd12425d52678ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage. The presence of multiple unknown URLs suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/fojesamumikowisusad.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/92126837874.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jorokimega.pdfIn PDF document text
    • https://serka.com/serka/upload/files/deloga.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/terefiw.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91500155584.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/kolesonujo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b748798da3---pisanesirizavegufene.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/keninapanagutojubolirixe.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/polikifeture.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/926b094fa4121f223b858d48c3cef201/29244657882.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/nokamusa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ffc73eb6---bogerimowexokogavodiko.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf471fdca---57783367333.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fexenuxesiwonufu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a6907860---46354301626.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccc1ec076---gojedijezisuzujogeka.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc6621a0---pulazanon.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b1b877009b21547e259a524b4997766/gefapesavowe.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/jiwanebeli.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa117ea979---namitupeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=william+gaddis+jr+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/kamisilaledaxerexuri.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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10512 bytes
SHA-256: 0a298338131cf4ea2e4284e1df7660fb92efeea00668c5ff0f53518e39a4f487
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 19580 bytes
SHA-256: 3040c131e3d76d2f4de3d7ca4cfbbdd6345d6545ce01b41e4a848dcc437dacfc

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