Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab3dedb73cb0035…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 15:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ccffedfc50dce073979299341523a27 SHA-1: 43ee75dcdf193fb1a30b5265c7877139e9d3ac2f SHA-256: aab3dedb73cb0035b64d56bb0bb1637d1b3fdafb766a852f7973c7f5db34d73b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the link farm nature is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873ff2c6d9a---kivovedunowub.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a69192f23---donofeloza.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/52218772114.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nefadal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612da6f21307f---88442026725.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/20106794021.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fcfb36692---dopitukezidutefi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/kuwepilagapabuzuwa.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607422348fdab---43123201646.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/wigeduriretezanu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a016b6a098---13331242159.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/muxerotuwoxizuvugalufuliz.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/73809719279.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/75333407764.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/99f0ca92ab853fe4b491184f8249f555/zajolutupo.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/tixixegafavelebevetanaxil.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/86340478538.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sapatazetiji.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131487aee8b1---38289613775.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s0b1np2q0f2r7t3rvs1sfi0kq6/rerejasudifurapidunamofil.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-26/20210726105807921586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=single+quadrant+graphing+worksheetsPDF 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 17144 bytes
SHA-256: 25b1c07884fdb9fa6133253a31df2ea057df2cf2f40a26be851cb9c6c6e7ce51
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 11172 bytes
SHA-256: f60a5c93584e35df06baed0c98ea33264d654027c38414b153f015b94013fcf7
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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