Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341e19aa8d9fbac…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 02:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15ab8a3ff81552e7621bd20ee8a3d455 SHA-1: 3435082c70a418aa2f72820abe24bc2b4025729f SHA-256: b341e19aa8d9fbac009d7d75c8bcef3f63a4ebeea373c0edec6d33a8634e49da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these link farms suggests an attempt to obscure the final destination and potentially lure users into clicking on malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://myparrotfood.com/user_files/files/wojilanaduzokilamubizofal.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/pusuxesod.pdfIn PDF document text
    • https://renewone.de/files/sedenarexezojepeluresikib.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/37211427168.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69361326037.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/69186123504.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/59930908211.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4963298a7fc43288c0cbd8479bf4a87f/movawonowesotax.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b14180d0c31a8cbcdeaee98e9942b7af/62980008217.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/46939998720.pdfIn PDF document text
    • http://specialcats.nl/media/files/satuwewamokibubom.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/50834810047.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/68337872600.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/wupomekokolezeponajakak.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a9e481c8---zivurofesowugotuf.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/denufixuzutugopaxila.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/mituvirosufasamilalobewir.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/19204048737.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/38334998130.pdfIn PDF document text
    • https://badrivishal.com/media/wuzokisinuresa.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/47474689586.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dobagajiworowivanagemi.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/36686869266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+enter+passwordPDF 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 17812 bytes
SHA-256: 41215297b9291126278b404f43fad0be5ac9edf5159b501c957b2425dd3d7c42
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 10492 bytes
SHA-256: 89e859da631ea12c7d68ffda8178e1d6b5e3b931e53d0b9661e2fb60ed38650f

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