Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcb536485684a03…

MALICIOUS

PDF

90.9 KB Created: 2021-07-01 10:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a2c61660b3b479b4aa429b894cd41cd SHA-1: f5de214883337dd224022ea2b94b4bf5bd9461fe SHA-256: 1fcb536485684a0328143ca16b9ea5e8e3d2cb7edd73a3604233dde7e7cd3eab
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised or disposable domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=almost+all+known+enzymes+are PDF link annotation
    • http://eltonltd.ru/sites/default/files/uploads/lagifo.pdfIn PDF document text
    • http://placc.info/up_image/fopatigesutubewexofirak.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7e63111845923fff56535d9ac71a7e51/36726453339.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/62738296122.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160774b6c1aea8---70499161545.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/e7o3sqbrjdssjcofel0fmjnv1e/70167926583.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abdab725c17---raseza.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/dupimubo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/roraxafigazikuzerijat.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/16186812813.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a6dd6485---18358495266.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/85318765550.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/72064715879.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/31595024222.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6f303fb7bd98c7db06b1bc079b56009d/kepubamik.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/79159406765.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062310093449.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200883524943.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5767367e---pofurituviwop.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db41d5e5ad---13553785501.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efca4f558e6dfb69ed3512dc5480e0cc/11215771883.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/76f554ddfc6d93de6ad2a3f8ae98c8ab/xapatanoludi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95d73833a---20155075105.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/70c0cd1b27b7673a9fa4316279ea981d/panuw.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 10512 bytes
SHA-256: 6bdd9a9ae3762ab6d13a88f1110b56e04890a0582c688e8331ca994a91d85644
font_02_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 18704 bytes
SHA-256: c2f00a4da782ae724502fed992102b1be260e85f53e10be2198fc94f65ffdccd

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