Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4bf2b826773e85…

MALICIOUS

PDF

115.0 KB Created: 2021-07-07 07:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 19df87520cf33dc55e2297320cc351e9 SHA-1: 073eda87372bf24ff0cb5d2800e88fdcd1e65729 SHA-256: dd4bf2b826773e850f7e91de914e2d72b0d0924253b6310a02ad9bc9d7c31a45
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609015ad4979e---latozomuganovemafosaw.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088df72a449e---7035947575.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d34b5ea6152---korelibuzebaviwepogo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc00645e78---76710319508.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/26154b113ee34d164a8fa187b482a8b1/2253181770.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8be3cc2a93734971e61cb13f0941b07d/nusiru.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1bcf3smj50ich03u90pkvq85cg/21909055683.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8984c63a1237cd84c9198d87e83fee29/16482132039.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724fb29467a---fixapuwojugir.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2a6cb043---tijumusunesa.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/novabugi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/17iqu68nih4qrklmc2foldiblr/mewuraxemogetofe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f542584a3f---xofojevatekamer.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/88456884829.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/65109567427.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/fazolejilifonape.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f45ee86a0---23437427376.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7c7676b0---robojivexavobijapolomuz.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rudisuwoxabanewined.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bc834359---gexerisenivesukufajezo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/e9g3ecc909t68tf78ufp5m1e05/58146942163.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b0913d8f50ca0be707ee1c1d27b78a7c/xifazegoz.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/23763456980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=asl+sign+answerPDF 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_off00016241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16241 18500 bytes
SHA-256: e2916eafca98cb5665aa8f4805eb4b6a4d6e78ee3db12a2ae1117a3e23ee09c6
font_01_sfnt_off00019158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19158 10132 bytes
SHA-256: 4b47e668bf0793149aae1c3651a2098e9f339af558bcfc9a45e80078e1b035d6
font_02_sfnt_off0001a820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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