Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe7f8a3619575e2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 22:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3ec84d453baa884070c7e6d63fbe025 SHA-1: 7de2bfc24a90e5ba2ad7b308eef14d83a77bc5cf SHA-256: fbe7f8a3619575e2ad19921f48b4ebc55a0d8974e8da78149126b53abe0b21a7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure impersonating cloud document services. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish credentials. The presence of external URIs and a link farm indicates a multi-stage attack, likely involving the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kovospm.cz/fotky/file/takigimudofavikubetis.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/tajekubobow.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613072f42be9c---72085514934.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/45039524723.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5d6b00d1---19811702833.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/41727727345.pdfIn PDF document text
    • https://limsurempat.com/contents/files/44325227631.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/20040307244.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kimavubiba.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/didiwenakif.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/61127535324.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/44254512950.pdfIn PDF document text
    • http://clingac.com/d/files/lamunenakanaminedapigul.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/37970d3d20d6dc72fc7d4234a569061c/suwigozabulujixunis.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109090346555065.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/9561444743.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/91b6127183f8ccce5531793f35f397d9/desos.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/40293400441.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/mevogudobemuzunemagidika.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/lixasin.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/21456124925.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090113035073499.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/koretekaduna.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/88042022191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=otg+format+apkPDF 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 10276 bytes
SHA-256: a0fc40d0e61aaf5d63ed4d27fe0e59143de3c69a58554d3af0631dabaa11332a
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 18668 bytes
SHA-256: 6cd9ad94f9e478cef0e8f7ab7d2e39d22db889107e1f7c2a58d032a1aed2ebc6

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