Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d5f41b98db98e4…

MALICIOUS

PDF

113.3 KB Created: 2021-07-16 15:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5920ce15e18c7ea33805f5647bc1adad SHA-1: d9b5061a85e9a010ff50d2ca6fefe8fb69001ecd SHA-256: b7d5f41b98db98e4eac1f5764ec5e356bdf4a05538c766e77aa84d73df4bf39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to phishing or malware download pages. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://birgatour.mn/js/ckfinder/userfiles/files/dakagi.pdf In PDF document text
    • https://addsfly.com/userfiles/file/fijixitidugipetepa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc1d07abff---datawakosirevokik.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286deb0572---46891405113.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c44ab9a47---59239324452.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4e2db78f15bfb0d4b1b871e9f032faa5/juwojubidi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/bunoguzudo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96febec3d---88209129618.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1djehoajgidb34qpmp7elgtpc1/97010743066.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f744578f33a4a719cc99d6b3a99735f7/tapapizaxevenafarukelu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca1c61e2d---61068691823.pdfIn PDF document text
    • http://canvangdientu.com/images/file/71282021946.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jabusegubagowutele.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadede73c6---17542228755.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58a9afe70---14935139128.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566178db91---24473713412.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0784ba35---79970272029.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7fb4f3148c8a89c9c6662e2959898ffc/8840253933.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210715_173855.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dunukijazej.pdfIn PDF document text
    • https://termocasasrl.com/file/jukerasitegawilen.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3088ef35fc---57242309814.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/rutezutuk.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e4cb1fcc---banowudupuxigakepuxoxo.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/15479680164.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee73518e073---panatolarawufefobof.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/84976435356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=baby+short+formPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E08 23388 bytes
SHA-256: 326dede9db78eafa5225a912e9a426866e192de242320f751af813790dc8ac18
font_02_sfnt_off000196ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196EC 10412 bytes
SHA-256: dba0839291dafe8dd73963a5d6ec1d063bc792da81c505ddf0bcedf5d90fb6e4
font_03_sfnt_off0001ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE9C 1924 bytes
SHA-256: ced17549418161cf9e05d1f3204aa3a6d354bb8856926961a1bc5bd52eddd8cc

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