Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd020a108a838a50…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 13:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf57ce8f76697458b7f5f0de7b93ac95 SHA-1: 1c5f6d59294a05fc97dfabd9ef1e5aa4ff30fa59 SHA-256: dd020a108a838a505900520125960752ea233c911a529a724edf32cd57b773a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the primary lure, with embedded links leading to further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b56ebdaa7a0---bufesabajojowup.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097257bbd7a0---75390827289.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e4939718---48591407042.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/92041624403.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ca68e4be---bumoxijofusit.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/10260132208.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jorodijeturisebuwomuteje.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/xomeperanifemamabaweruxov.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/lirixopidokevenuxek.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bejefiriwob.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/77408587367.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/47khv1sd66umt40l2sabr3ui6q/61451561925.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42521906197.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c020fb01b3c---14508912286.pdfIn PDF document text
    • http://cwesp.biz/upload/file/30978916585.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a42a92bef---pewugebubonekagusozino.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/38993534074.pdfIn PDF document text
    • http://julianina.de/upload/file/niwisuvuno.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2345f4d---44487033311.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4fcc74c62---dapakuxadewafubo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/79d8jmr6gveo3afoctcl427fk7/1755004771.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabce7476c---vitobis.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/42378336363.pdfIn PDF document text
    • https://wonkingchina.com/d/files/laler.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71288560774.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ruzari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rounding+to+significant+figures+worksheet+ks3PDF 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_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 11204 bytes
SHA-256: ab955b7bf608567181568d9eac0752f0be46dc10009d82dd7ac787ecb9fdef96
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 18628 bytes
SHA-256: 6a4aadd5539d3652c5f46ceaa5be87fac57156b5e4441db4fb5c2dc474e8e9a5