Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3224d4a8f27f7a…

MALICIOUS

PDF

107.6 KB Created: 2021-08-14 22:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76d26f5ea162d3b6c392e8f881b58eb2 SHA-1: 913553d1a9bd73baa0c4f89465293d8841ffee34 SHA-256: 4b3224d4a8f27f7a429080f273cd0dd3cf8803f11b9d5b4293b2f1b55f8ecc8c
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. 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 0.9976

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://foundryindia.org/userfiles/file/75376807997.pdf In PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/79092899251.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/wisagotidoxodo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb65f99eff---kituwifipoz.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gupagesaxa.pdfIn PDF document text
    • http://checopharma.com/upload/files/89638756316.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///somilavijokewopabotif.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080781931c69---8927660214.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a2afb613383ba6d051a65a09091e3c79/3267758487.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad759dac58---57743910730.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c090ef94364---89145640781.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/5934700895.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jafogej.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/46325001486.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/26837208662.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/2936517229.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92462811fa9ad30c949bd12fe6b956cc/kupoxowutam.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/ritesekeped.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/cbf00787e34864628371dfbc24493bb2/bedoxe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42134c5ccf---weposom.pdfIn PDF document text
    • https://rosycaffe.com/file/fuwevutagikarefagoz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7786d6774---mapazebusapaxiwomal.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a52cb626d04---87883678392.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb405362e16---2652854266.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4d07bc794910905fb11bfa03242c58e6/merulupafamamune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tamil+new+movie+download+madras+rockers+2018PDF 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_off00013ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA2 17824 bytes
SHA-256: aa724bb2748532081aeac955002e323f2b9def580d0c943998a1aa7b5f68911a
font_01_sfnt_off00016d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D72 11140 bytes
SHA-256: a532e73abb6e8bf74ff2259f9e60065316da36ded249c2d3a096993d15861807
font_02_sfnt_off0001878d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1