Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a5ceee4b20dc9e…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 12:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e88394893eb6d6383ecf3ff7c65c1346 SHA-1: 4cb6dd6ef5eb41bfa9b064a9b4615b9c24a43ccc SHA-256: c6a5ceee4b20dc9e2f223c9ee88a0ad294247e09cf2eec8810778ce51fd9e789
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, many of which are WordPress installations hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces the phishing and malicious distribution pattern.

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d059d294f8c443489b067a7a13e9dfe/puvelu.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4dtv4slmqmd87c126pl6pcgme5/44170217143.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uiv9ppamvutmmrqvj0hsmtgcsr/63748440660.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a54c9d98540b87f19ea63c74a2879283/57964241745.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/vivaresatelugowasoxib.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc594d8c3---nolagaxivuvaro.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/fivarobafaxefofepigefelu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/60549740978.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bonoxagukapinog.pdfIn PDF document text
    • https://aitalk.vn/upload/files/poresuwoginomisekufed.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/nukak.pdfIn PDF document text
    • http://sam-global.info/files/file/9262350061.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2095d3b7---zunugirupajezotinezaba.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/bibuwenigamofazuwuki.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965d4cca40---27956904003.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330b39f50---sobisipojikukufefijad.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/21668068768.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fe4e837ba0d4ca4dd8439c57cde9058/kepinojukatezomijes.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be048ac13ee---gomaz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aae3dfd99---mixigatiwakidir.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/35439777985.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210528211206.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/684760270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=usb+audio+player+pro+apk+full+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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10932 bytes
SHA-256: fc026b02f8d916e78975aa1b6b0bb7acee1e734f43a0a23b03fa8175d0212b98
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16676 bytes
SHA-256: 819c408d9097628c9441c373a4959a5eecbb81f11240f19abc2d5fc106ce8907
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1