Malicious PDF — malware analysis report

Static analysis result for SHA-256 da557543132a6704…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 09:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f38f4ff58b29d62427ce240429d7613a SHA-1: 961d20fbf458c2b06be8b05bfcbf2b7d870d9a33 SHA-256: da557543132a6704a31bd5acbea418d30fd4f71e2bee139f7d5b2979f6849cdf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulun.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vugojebinoku.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b2ee24156---pusixasimuvorejebukag.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/vimawamupisabowanutaxotu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1627085155.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/9851158632.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4288f07658---pedalowexibewemezijepuj.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/du1pnuhh7ljv17lcrtluussd4d/puwug.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/65005059943.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210614184225109.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/52b5976f040cee3dd55aae94fd752795/tafafokugenudakanolem.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dmjl8kb07h6up40jfespm4nvk6/10000572776.pdfIn PDF document text
    • http://k1a.ru/images/files/file/63835352042.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609402b2e3b30---28455444857.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/25541390744.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/sogofurewires.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xurofufuwajena.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d66016020963f08fe4a524903a5c5a54/wivopesatovukud.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/57796707203.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/16517290464.pdfIn PDF document text
    • https://jetaime-shop.com/files/sonavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=another+term+for+situationPDF 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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 18216 bytes
SHA-256: 2baf7ce90cbadd543cbc2937d6ecca330b6d7c8ef6fbbaf9d41d6e90d82f68a5
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 10512 bytes
SHA-256: 17ac977d2461b7752c77dfcdf88f8af2f4c914b7b5c5ceca699d57c98749c4c2

Open this report in the interactive analyzer, or submit your own file for analysis.