Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a854bb2c6d0b7de…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 09:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bbd5b0cb714febb10b30b3a50e200645 SHA-1: 116f2a06250df6fab2e5659a53a9573ab7e00366 SHA-256: 3a854bb2c6d0b7de7d3f601e54e28247813c0a2bf209fd08c2ab159285142e84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded JavaScript stream, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or redirecting users. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firmabudowlanawalczak.pl/web/uploads/files/18931078584.pdf In PDF document text
    • http://kruengrangthai.com/files/files/63459767539.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///53130131116.pdfIn PDF document text
    • https://dm288.rs/slicice/file/49161331583.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/rujejedapodolimut.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/lanuwuruvuke.pdfIn PDF document text
    • http://charivne.info/images/file/45493866446.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131203239e79---wewutufa.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/tubumeraveguvukoku.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/95162524717.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/32413133404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141384227eb6---88223601997.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/30533610407.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/50544661049.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/5162666534.pdfIn PDF document text
    • http://8njl.com/userfiles/files/49817763287.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/6671315085.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6e7c8815---rimilasijibutemevimu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/64045625257.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/30729537415.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161361e450323e---96150787275.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/27888681328.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/baregatop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=black+friday+deals+pay+as+you+go+phonesPDF 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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 11160 bytes
SHA-256: 872c0fef74a6dbd0234c17a057fd0e87070361025f51c455f5e5b887b48fe455
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 18008 bytes
SHA-256: e562c05f1e784f17071feebb940fcf762c9642bde614a4b69d52a7267df83a34

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