Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd5abe07a2a35d3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 21:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06676724fe7dff3ee6078f3f5cb83b1f SHA-1: 7772fc693b81d57e60570d4112b27235a0041dc4 SHA-256: ebd5abe07a2a35d327d53f9c3dcdbbe3350bf4979ef2e02d1184f2fdfe534089
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bczenekar.hu/files/file/wamavowakedofusefokis.pdf In PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/mumonefe.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/89714118156.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/nisireroduf.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/50578302460.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/37859638738.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88cf28875---68601739855.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b26a71feb585f39349ea3b05d4cd64d8/14794692426.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071345e69903---20073585941.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70883cb8f0---52436439440.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/biwinonu.pdfIn PDF document text
    • http://kco.su/userfiles/file/81116588650.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/luvojugavigofuwawanetaf.pdfIn PDF document text
    • http://ridendo.cz/files/file/45404665363.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/sifixixo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9838da7---3596802744.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e93f486---11764629276.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b5dd9985a04f12aba4593084338ed42/tatumumokex.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ff69b3lf5vmva7pvk1206rk5n4/tuviw.pdfIn PDF document text
    • http://saint-party.com/media/file/milope.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/laxarebezotosedas.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o8uod1j46b9ev6pfkijlu8i562/dobavuserafesoxinizev.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b7a2d244---ladivudod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=que+es+dislexia+y+sus+caracteristicas+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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 19068 bytes
SHA-256: 169861d53b4cf37be9a9fa7c0f83d5b856e3f022b2ae3cfad636b339ea323b09
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 10764 bytes
SHA-256: 7972018c098e3e8bb38579f4230c0bb7479a45095e5f6a1316ef9f92a554b759