Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50261669b7c565e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-05 19:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97070d9b44de20693c2589eb663a51f2 SHA-1: e65a9bc9d822aba231856e1421b5548b2e3513bf SHA-256: b50261669b7c565eeab8b119f091eb6b0925b107623619488edfa5526d42b236
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the nature of the hosting suggest an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=canadian+dividend+stocks PDF link annotation
    • http://tydafa.com/dafa/uploadfiles/20210627044434.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a549e94c---1531850373.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec0aa26cf---30485663937.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/abc9d95e6606139bce9329998299a820/xavewinuwonomesivi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d69c4208---4322147242.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608917f931c5d---lifasokubetubigovalakij.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65530207049.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/51960172368.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/62380851628.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lafasusa.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/990653767.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/6710471369.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/74c1f2f13b27d921125d8df9d939e628/rezosuwabikat.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a9ea85c54---guxuxu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/24324814647.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083072e357af---tiwuxatajudoref.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b93639839ad5eafc6779c971462a6e27/doxejagexuruvarazaj.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/11324306778.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/0n0fv494tlukqp19jrn6s9hme4/7990963581.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/18bb49e1a5623a890adb5f7589e26aa1/98181228092.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/wesosenabadamifegab.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rifumokulawawi.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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 17300 bytes
SHA-256: 941727811f4594e227c03f78a47362710f01f6d498dba70c356105030b2c5d2e
font_02_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 10408 bytes
SHA-256: 2dc5ca319cc4f70d1023b56f246389f0b7aa8b7e92e6812a0584731ef0cead77