Malicious PDF — malware analysis report

Static analysis result for SHA-256 103071d590ab5987…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 00:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91d5e89c975014d3468980a0046986d8 SHA-1: 87027b4009fcc91a26a076dbfbde1a20866913a8 SHA-256: 103071d590ab5987f3707b59aaa40de95dce758f366006cd89e743ecd9a3f9af
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tourgardan.com/basefile/tourgardancom/files/88294030414.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5e4ee8e640bec87d266261ee2843147b/tajowuzekuka.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rorev.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/41157547076.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26049331897.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/63176120214.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/kalozoxufovivaxugikomivux.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f43e1a292---90324225783.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/zelofavizadotajulugadexiv.pdfIn PDF document text
    • https://susta.vn/userfiles/file/82224182537.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6e3e1326---71970404424.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/dokakiwexukopikum.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dusofuzemokima.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12902b223---xovovewe.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/sonagugevameto.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/k1cq1ff5n8k45hp2otj5tr0jrt/lisedonorupajojudiz.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/45543765788.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/89317429398.pdfIn PDF document text
    • http://splogservice.ru/content/file/33712908756.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/86700723776.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/45431876561.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/dopovoxojopakitibijipakiz.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lodawukewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tamil+crime+novels+pdf+downloadPDF 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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 10800 bytes
SHA-256: 443aa157d939a7df49f7469b2300715bc16efcd96b58d332cda2510b2625651b
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 18396 bytes
SHA-256: 00922dbfc57eaaf83056cd0c7a179fabb928536f8e0329b476a53b90e0070b54
font_02_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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