Malicious PDF — malware analysis report

Static analysis result for SHA-256 9176d24dd83b1f96…

MALICIOUS

PDF

70.9 KB Created: 2021-07-22 21:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3dfeeb8acc1b89f4b8e455899317860e SHA-1: 842f1eee530f860f0cd0fbccdc47fdc1930a6a93 SHA-256: 9176d24dd83b1f960ee0caf04f7dc6865c3fa8c8c79f81bc9198d422a2e31b58
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585978ee3a---98751872727.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be974330b12---rogiludubepivamufave.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773f3986844---74718581557.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87b2c2635---xalewixifesada.pdfIn PDF document text
    • http://renovator.cz/files/file/fomalikaxoxedebun.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/95450710579.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/jitebaraforazetina.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945fd7164cd---37341125462.pdfIn PDF document text
    • https://masihpt1.com/contents//files/danuwerazuwudigax.pdfIn PDF document text
    • https://luminex.pl/upload/file/vatumasunevagimovub.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186230ac9e---nutut.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/3424201133.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_013044.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/16ec8077689e17ff312b59789778919e/88077827436.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/55d573786fa1fb79a5bdca08834b04a1/749849337.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160847217e8128---52405668683.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/21654611174.pdfIn PDF document text
    • https://network-italia.it/file/besubuj.pdfIn PDF document text
    • http://darec.sk/files/files/88163936138.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/pokupiziterenusupumato.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/numututiletawugitexozo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/26f4eb25190d77490cb9ace408c37592/dokedoje.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/rowano.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/81458452819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=string+array+in+rPDF 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 10008 bytes
SHA-256: 9f1e5783eea976ef1ef4ad29f0845590676a0fb633997dceb399b334c2df7e9c
font_02_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 14940 bytes
SHA-256: 33eade3ad569d962f9c9b6807bb6bdc0dd5c4a24fd057af638c85b371bf2fccf

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