Malicious PDF — malware analysis report

Static analysis result for SHA-256 338b3b8df8a76058…

MALICIOUS

PDF

88.9 KB Created: 2021-06-21 05:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af469a0e575503112661333ed5a34474 SHA-1: 5b1c02c49052957000e0497266d83ba50276fab2 SHA-256: 338b3b8df8a760581ad570ee6c6104ac4f46982c7506c228f74a5552bf20f5e2
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9995

Heuristics 6

  • 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://ketchas.ru/uplcv?utm_term=brush+lettering+basic+strokes+worksheet PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ppfrjlguidghfrhk4u7hj8th5d/tafawolurufamosubawadu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/i0pmvocan949monqbrqemc2fcp/gepatonabovube.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e246c69d6---79295721449.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a19e2b83---99251092104.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a6349a51---38427593331.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a653f8fa0f---63166143773.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01bcc1a2f---24614197909.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1iado8gndtvammn9m4o7pv6qv2/kefovonaxaxeseduzubadus.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a698c43b757---bokeraru.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/20354459598.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zoxeguziwegikiguribativez.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5d36ihv8dd7jdanilpe9gkq0d/gutilozaxalomedop.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/9725038133.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/59009873323.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/egk3f943h8kiuud1f5sbg4pr71/11990725929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5408 bytes
SHA-256: 9c5bdffa4fab78ef6aed2d1072c1c0c814cb088045b59f9510625869ea3fc55f
font_02_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 2044 bytes
SHA-256: 28336a0cb3f8e641e75945af3d35324194abd932e21d2bc38800f63db353b10a
font_03_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 11800 bytes
SHA-256: 2945d9ca5520b51bcfda349340eca5aaa57f442354e303c331a5fa87a3b740f5
font_04_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994

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