Malicious PDF — malware analysis report

Static analysis result for SHA-256 1863d15d0f33f7b1…

MALICIOUS

PDF

130.3 KB Created: 2021-09-06 21:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f33ab57d1ad097c4b9010c0b4da59f87 SHA-1: 03a4c6e32a5ab78730c2078e4aa0c0b833e931fd SHA-256: 1863d15d0f33f7b121b6549401d9109c0134371764f23897f500dd9f53a6936b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://magogaralbamoble.com/galeria/files/14751852570.pdf In PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/48499554335.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gusikedixewapuvanizifodof.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/rexukomezo.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/84194550289.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e71c664e7b889812d64febde04ca1799/tugiwepotesojobafufij.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bajorizininivijaxota.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/suwitazavebiguxizilitik.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd7e4b350---42727997295.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wibomelegupogozumalo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mavanagodekikurilimusak.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/65bc00ce83fa6da9c21228602e7c8426/9200080417.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/907982684.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/13127620182.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9780219715a515da39d4243962320556/loxibefopuwonivisedapi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16116cc36d8618---xotowedezadusebesavoz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n0blu9bp19jsrtr7hecuvitofj/fefuvudap.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/1757513615.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/fapamika.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/kosexuf.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mp1g4b1ce5m23kbg1fp9b599oh/21226629969.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6daebbe615f033efd8f78c5820b911cc/96105695684.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cnc443rvtbabnqj4hi2rgnvkg4/49298969610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=siemens+s7+1200+cpu+1215c+manualPDF 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_off0001991d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1991D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B12F 18716 bytes
SHA-256: b6d6b1ef681f65930a3aad1942fe451aac2b928da224957de5af09c06d3cf0a9
font_02_sfnt_off0001e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E24A 10872 bytes
SHA-256: 99f0cf3fca39d7c8e3c975e912b7e1b9f71d6f387fd672f081c91d7fbc521108