Malicious PDF — malware analysis report

Static analysis result for SHA-256 09870e198f863823…

MALICIOUS

PDF

71.8 KB Created: 2021-06-27 20:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1bf78642c69dcbee127bbd269b51b8eb SHA-1: 77957132a3e1a26ea9427bfbb689db7b3f7c61e0 SHA-256: 09870e198f86382399229f1226b6fc35b405c8f93ba5f602445d3d14fbeeaba1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6fcd816f799f233b7d716cd923cb997a/fimogotufapetumu.pdf In PDF document text
    • https://kaptenhoki.com/contents//files/jegadaxalegiguzebawowa.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/eedb4338696dd97206508e6a9eb80a95/53007198498.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/169887fbab87f4648ce8aaa3cc410370/daruzedigufavavibe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9cd54f74---79467419074.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/kalufod.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a25c4d54---tifinusogekazuwavekogija.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/digajavirejukexixamaz.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/97408229611.pdfIn PDF document text
    • http://teplospectr.ru/images/files/37483521565.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/32278512184.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9l2og2n0k56cikupktna1sc070/1341602350.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d943276fce---87673855247.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/896ee3c1fe918e147b97bfcbce6f09b6/40564015653.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eaae1db1e---95617617083.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210626052301.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd735ccf51---jewakot.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076204333455---junipuwepaxapewimabud.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9cc88d9f---43158660631.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/16851778733.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/7dd5ec14730535f798ee06550c6b5fbc/madako.pdfIn PDF document text
    • http://giga.sk/storage/file/99386085164.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/2117634895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=michael+buble+falling+in+love+with+youPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77F 16268 bytes
SHA-256: d3c6d85e8b72839d45139bfd6976f20029564f0df0ebf94fa628a16e49d91ebd
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10844 bytes
SHA-256: b1d5a664027718142f6814a335dd1dc2d46ddfd17c3b8c2b0d9ed98b9e7f97c9

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