Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddd5cb80b34b10f…

MALICIOUS

PDF

102.0 KB Created: 2021-07-07 11:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e05cf2ec8183f6958e27a91c8f530fe SHA-1: bb90fcaa6058ed92463bee1c53158afeee048c13 SHA-256: fddd5cb80b34b10ffee927e9f03f05a5f2c08bc4dfe69565aee9bbd3f545d4a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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.cenlaenvironmental.com/siteuploads/editorimg/file/55354545082.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/71dd70d842d7865b1ce658bcad364476/91201101643.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e1e5d53b95a32142c4aeb00cd81ceaaa/juxawuworitotepowudikawa.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/dijodemuxijazorejuder.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/88014594965.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/480dgj5bgeo1p65d87ko2g0d43/75556531752.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/82505381462.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/rimokati.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/44640465599.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4665dc60c284d0d2b4b9f9beb0addfc3/mumixunu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aded9860841---44998635362.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/54913163026.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9865fe17243649040e8c1a251049dc14/wuvexe.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/baxagokutiwaza.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e1a36a8a---bejawonuno.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19934274685.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/92733433968.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gegikuwipidajilexakawozi.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/67512045411.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/91eaafb40fb45c25d3110aee19746f18/nozilekimapekupopuze.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72883887912.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/37117167235.pdfIn PDF document text
    • http://akssert.com/userfiles/files/jebowojujekeze.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a1f009450614804be41b03b9fb788058/9568361905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=coco+mind+over+mutantPDF 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_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 10512 bytes
SHA-256: d67f76de0b2b2bcf8fbcd4d6c5938811c3efecbbe551523bc5e0a9e5b37be40a
font_01_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 17560 bytes
SHA-256: b1e4f69bc727ad2147cbb40112bf70e81460f566184a159ffd400796fa7614c0
font_02_sfnt_off00017308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1