Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555c1c664b8446b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 11:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15c44675fafeb816bd042f605c561a49 SHA-1: db71df1fa47bd7f35dcebec20041844852d44078 SHA-256: c555c1c664b8446b223933e82aac417115e1ebb1f9c4135525b0281e2771f1fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://k-yoga.org/file_upload/spaw_upload/file/20210625054842.pdf In PDF document text
    • http://andreaslasnik.com/data/files/dewolulu.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/jizikigasilorinajuniwija.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/72288247823.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mawivasom.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zulozokimigu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffc87abbb5---fijavewasod.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/99360255316.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vumelodaragarepafi.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/69701276631.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/buzogegafumoviredosudir.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33ce69748b---zuwusabibog.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/fepevunuluvox.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a31aded986e4ffa66e7dd00a760695a9/murusa.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/zapevemufi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104df86396b2---daxuduminulose.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255425d2f1---43637237153.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/dinigebudawiwisunet.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gs8lqsg3hpoiirb73gmci29234/81219506697.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/18980859312.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/51514134861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aphids+life+cycle+pdfPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 18864 bytes
SHA-256: 5e32b74b354376823fe556e5c8ad5625c4acadb8c71e1f5573135c900ddfb626
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 10228 bytes
SHA-256: b73c492b25eadd771945a66adcf70ad5354d4d82f7c7608e65d0e057bfaa1f34