Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9304bfe6f49d97e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-06 21:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 776feb7bc18c0fe51157ce06191466f6 SHA-1: 6255546c27a3833c2ab41cd6f04844b83e8fd798 SHA-256: f9304bfe6f49d97ec5cbb8dada0f399f8560bb4cfd7637c4b4510f8250a8fcf5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and disposable hosting further supports this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://twozonechickenlasvegas.com/uploads/files/18433744816.pdf In PDF document text
    • http://cyuanmei.com/userfiles/file/12403135773.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/abe95c16b1096366ed26ff24e62e1ddb/jogosumebodoguxukete.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bda91bb70---15417534555.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b1e7d1ff---90254385244.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wiloxulopu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c9420cae60f9baf49a9ab397ded3ed68/gipuvikidutavem.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5c473cbb4---dakesitadojo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b0aec44120e6fa82c89220fd2face01b/30385844302.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/60273603166.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76034406406.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/473s4l56n9qc81296datia3omu/4908940463.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1a7c3b15dd151455ee6ca2ca243ea4c7/balugejikodejuv.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bc5e29e4---74157404573.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e0eb1e249e5a39d9ae42fa4199207a06/81199286130.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/12280590024.pdfIn PDF document text
    • http://wernitznigg.at/files/51380510188.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/77034812853.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f9bebed6---tudegit.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pogabiwogerodeg.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af7c2ed86---dixadojenubavojafani.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b878f10b92a---gobado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+global+water+cyclePDF 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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 10448 bytes
SHA-256: 758a9bcfb2600f67c6d966c05e64bfdf44a8d63f4058d86e121c0eda7ff7081a
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16688 bytes
SHA-256: 557fceec72e67406e632814157b36818838d1b4603639e289ba4dbf114bf7d4f
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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