Malicious PDF — malware analysis report

Static analysis result for SHA-256 94821f206016fe43…

MALICIOUS

PDF

86.9 KB Created: 2021-08-13 08:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2d543d82c399c3fa67f0366b44a69406 SHA-1: 095714487252ed56fe546e4a52468c8649275e37 SHA-256: 94821f206016fe4359c34bde45d8e9e04e5534f342dddc4506b36ee61823dbcb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22bd524440---vapegafelulul.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/rugazutisibagafeteremur.pdfIn PDF document text
    • https://o-dance.com/upload/files/kozemitijagezawexukopeg.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9aa17e42---5578689725.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dbd2e380---nixup.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/45dc0f0725d431931ae54de2aba27240/65031650874.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/s7591jikbv5f2a755a8nibhos5/kotewukojizabedutejepixuv.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160810eb7f2006---92224021305.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075315ed900c---vujawawavudufezexuze.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/n55fics8bqnc20udg15qqvn0ec/murobudajosumoz.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/29759299409.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6e834b21dea405ef58c10fdc099cd6b6/laxitewurubowometufabos.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/xapekem.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/94658526635.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070608051173499.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5661fa3d---sinukanidofikugijigogoxer.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/domikilazabozanixaleguv.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/85711561203.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/51e8fc1fce7896ac90abf142efec927e/fekijilelebutimovu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9b43a29c---xonapipurawasogiri.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/102128239978.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/jopurekufivisaziberir.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hjgrsh6qrn0lf7kjab9a9dapvm/lobunerakisan.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0e684489---54325240374.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zobenedalodi.pdfIn PDF document text
    • http://talleresjpg.es/img/file/28014525266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+fundraising+thermometer+template+powerpointPDF 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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17296 bytes
SHA-256: 15c7ec85f804a8020328de08e0d4a42a7f9ea9f50266e9007a5dc4fbf32605d7
font_01_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 11108 bytes
SHA-256: 757eecb1a0dae8b99a768c75f6a8582cb6ac607b7625e961ce675416849cb008