Malicious PDF — malware analysis report

Static analysis result for SHA-256 982d5576b44cddd5…

MALICIOUS

PDF

98.2 KB Created: 2021-07-23 18:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bf24fe87a5e664ce2957983c10f7b9e4 SHA-1: 7623f4b87dcdc82d255272f146c07dbcf531729e SHA-256: 982d5576b44cddd572581e94d5f15820b91368caa17fb3c5a74d97df4153485e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The presence of multiple external URIs and link farms indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c771d24c151---62216436905.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075d19c6e8e4---56580569547.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/katusazevuxa.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/21886414767.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6f8e6a3b2478e30bf4fc68025dc526db/govujoridafavovuduf.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/55972062375.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a924e5aa5---gajofiravobisur.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/79679412645.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3qtu4sp6smm7epj8geco7r8f30/fogukutagapebuvorimopuj.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4d06f96bd07e68a49d247070910cfe26/gozeguwujujaruf.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/xumuge.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/7267426676.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e03c5228f---95875311298.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfcf04d73---xaviju.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sap1mo3hl9l7aptcvkair98432/rogukujuputajebe.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/10400741348.pdfIn PDF document text
    • http://chieucoingason.vn/files/torodetulale.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607372386f650---wabovor.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080358e7835d---70765990966.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093bc4f790ca---sigapidegu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/nuwisaxebanuvituwepakog.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/jebiwijila.pdfIn PDF document text
    • http://technocom.pl/editor/file/93269234943.pdfIn PDF document text
    • http://firegallery.ru/img/upload/tetanafoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dna+astrology+in+tamil+pdf+free+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_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 11040 bytes
SHA-256: d6c1eda322a9862b9fa60ad85814953a73adc01f2d1fbdcb1c99e78d300032cd
font_02_sfnt_off00014cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD5 17800 bytes
SHA-256: a79760d266a88713761d37a4e0fb9b0445a69f20c58c8167e75bce446341ba15