Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8379033a9cb8cd…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 15:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a40527a3c11c5a823d35ec1495cda98 SHA-1: 48bc70e3df9febc29677b5cb1b28d8d0070c7044 SHA-256: aa8379033a9cb8cd9f883d2a18d2b3b450261c7ad0d1ac0badd379fa3e35a340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=corrective+action+preventive+action+pdf PDF link annotation
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b049da6bb---ratetanabaguzisezutugudut.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/jezekujefifimaz.pdfIn PDF document text
    • http://roocenter.ru/upload/file/ragefolatupogedikikifad.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wunuberafagotipobugig.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/64554342162.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f3a7b690---41439530125.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/tukafudujupex.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/37260785213.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/670303233.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/38986226846.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/68789274393.pdfIn PDF document text
    • http://teresachild.com/upload/files/digufezumibidijakakemude.pdfIn PDF document text
    • https://felicityokolo.com/file/luvanigebu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082384c3c122---29806553513.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3oqdkenu9d7d39g3nmgojc48tn/19972754608.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/96440824912.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862123d43ed---10831941634.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750deda01d3---kubutomirufasetawagus.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/ligagepafirokedepe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876f04188a0---xapubujidita.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/31977fa1bf611034fd898145a7781c74/24933791675.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/40299422343.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/80099999941.pdfIn 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
    • 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 17924 bytes
SHA-256: 865b9afb8a7f4ab0bc8d71f5c5a5fe8fefb4c9fe8c0d2a88eb2200bc5e6fe3ab
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10496 bytes
SHA-256: d234cd7c4c3cab8fbedb54c7cf4ab808847b31253392d6200d7b0185d6a9f85f

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