Malicious PDF — malware analysis report

Static analysis result for SHA-256 8352d791a32c4454…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 23:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 12d6d86a158d8907a0e5993b9a17caa4 SHA-1: cbdfc8f1ac9a1ab35a6755d3e3a0d07e1ceabc93 SHA-256: 8352d791a32c4454efa32bb71bea4ac24d546f93b2450d814a744a8f0e85e4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, characteristic of link farms used for SEO manipulation or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99d31915f0f5925e7fa69fa9a73fe887/84558070177.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9775ab81d8---fozisojirosi.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/powafuwilowutofe.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ga8nouq7m5vi2vrdhma153nne3/60106947746.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/kufugopuwemibewosotuwuj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a698488356---wilipuxulur.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae3e22eff---75656205594.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/91348476617.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gevosamulifinumudotiwuk.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9nqrn609c36rsgtsm37mqr8qq3/58344061890.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3mguit72vn2ams2pjt5so7b3lb/zotemaluxureriwi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/595921460.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/bb94845bd16dcabae95be9d7de3b9528/52808922984.pdfIn PDF document text
    • https://tepihtrava.rs//files/fudubinurawaxamevafubenaf.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/55544366465.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/gojafososipuzofamanavib.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/mibetatixuvuzesufesizom.pdfIn PDF document text
    • http://come2menorca.com/images/file/silekedoxexodu.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/12988146656.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd330894a6---tutaka.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/14063712005.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097fb498c73f---97763544248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=basics+of+oops+interview+questionsPDF 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10880 bytes
SHA-256: add4dd0aa9f9508e37bf6a5e140be9778e9ec456f610e585b425f11e739fbb54
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16308 bytes
SHA-256: e06b8940f5b0829fbdf09e46c76c15be3d8cb1b258001afc1950dcea2843b945

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