Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6774c18f63c715f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 11:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa3d407d78519faf5bce8c5bbb9e191b SHA-1: 330ffe5eee7ae73119b0595fa327294beb21a083 SHA-256: a6774c18f63c715f1d0b3a6fcd9d12fa01981f96f9271f135f0035dc64f2396f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=sample+determination+formula+pdf PDF link annotation
    • http://ttfi.org/app/webroot/userfiles/file/xekedo.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/sakojetubefezig.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161241eefda29f---3673391342.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/rekodevekupuriv.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e72adf1f---banelenokoj.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/72660163798.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/sifoxojewu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa3ded552d---48529946147.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/62108297938.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dcf9594aa8460327f711a65360f5223a/36031435993.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/9156407770.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/gijivogugeled.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/db346602ff6d5c70bb708db3382060ef/gurixagadonof.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/43680894693.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/42542792128.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/rodepuf.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082df4233320---93866810601.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/19560652876.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021816203274051.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160778d475a9ce---pukonokakezuf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16129bd73c6a0a---97530786085.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955ba31204d---liwatimukaxetewizilo.pdfIn PDF document text
    • 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 10668 bytes
SHA-256: 51d7c856ec1fa3021e51bcba19dbe845a88cd300a5472427aa90d51aea52b003
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 19384 bytes
SHA-256: 49004aec08cbc973d639783df54fa74b08d2f676f22f24acb60cd84eb0f1b714

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