Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e09c0a8b9c4a9a9…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 08:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2bdbbaac07f3a12971a6aae9595ea92a SHA-1: ec8dd8cda1b8fa6117ad9609fdd407f609885454 SHA-256: 2e09c0a8b9c4a9a99bc57c25c11f9d707f41709ba36999ef28d8ab746c7b2698
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edfbaf86b12---kiripo.pdf In PDF document text
    • https://ivaco.it/file/54658452707.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/91079417824.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/20126202665.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0a91bbe7fcfd25a44e2b01dc0554603a/rovomupudojinopop.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071007092373499.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcad591ba---pexisukenejaduv.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/35124212640.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/79131d002eff39054c88223c5695418b/14946811005.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16086d478afd81---34923106238.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16dd40ca7---72468491776.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0168dd6da08d56cf2889e6b8210cdb8f/fukewovelipuwije.pdfIn PDF document text
    • http://snsi.jp/image/news_file/tofatef.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11605ea17---5326684834.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4c37bab9---kazijojifurimoxuzufujuvu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/45232684599.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3399aecf---99275733050.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/sifepuzirezuxolazoga.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/97968092320.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071dd76675c3---kugolulafenuv.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf8eb9b2---87098630628.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160808d16abdf7---20954075018.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51c31a06c---39671667790.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/42522408506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+introduction+of+formal+letterPDF 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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 10964 bytes
SHA-256: da53563e4a20b3c8fa8115e97555be26bcb417d770bf5225b81ea737000b801a
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 17264 bytes
SHA-256: 895e7025d1867d5fdb2e29763c30664a8b2150e00390840587f105e3da42b6f2
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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